Non boiling and non condensing two-phase heat transfer (ht.conv_two_phase)

ht.conv_two_phase.Aggour(m, x, alpha, D, rhol, Cpl, kl, mu_b, mu_w=None, L=None, turbulent=None)[source]

Calculates the two-phase non-boiling laminar heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

Laminar for Rel <= 2000:

hTP=1.615klD(RelPrlDL)1/3(μbμw)0.14h_{TP} = 1.615\frac{k_l}{D}\left(\frac{Re_l Pr_l D}{L}\right)^{1/3} \left(\frac{\mu_b}{\mu_w}\right)^{0.14}

Turbulent for Rel > 2000:

hTP=0.0155klDPrl0.5Rel0.83h_{TP} = 0.0155\frac{k_l}{D} Pr_l^{0.5} Re_l^{0.83}
Rel=ρlvlDμlRe_l = \frac{\rho_l v_l D}{\mu_l}
Vl=Vls1−αV_l = \frac{V_{ls}}{1-\alpha}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

alphafloat

Void fraction in the tube, [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Lfloat, optional

Length of the tube, [m]

turbulentbool or None, optional

Whether or not to force the correlation to return the turbulent result; will return the laminar regime if False

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

Developed with mixtures of air-water, helium-water, and freon-12-water and vertical tests. Studied flow patterns were bubbly, slug, annular, bubbly-slug, and slug-annular regimes. Superficial velocity ratios ranged from 0.02 to 470.

A viscosity correction is only suggested for the laminar regime. If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

References

1

Aggour, Mohamed A. Hydrodynamics and Heat Transfer in Two-Phase Two-Component Flows, Ph.D. Thesis, University of Manutoba, Canada (1978). http://mspace.lib.umanitoba.ca/xmlui/handle/1993/14171.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Aggour(m=1, x=.9, D=.3, alpha=.9, rhol=1000, Cpl=2300, kl=.6, mu_b=1E-3)
420.9347146885667
ht.conv_two_phase.Davis_David(m, x, D, rhol, rhog, Cpl, kl, mul)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

hTPDkl=0.060(ρLρG)0.28(DGTPxμL)0.87(Cp,LμLkL)0.4\frac{h_{TP} D}{k_l} = 0.060\left(\frac{\rho_L}{\rho_G}\right)^{0.28} \left(\frac{DG_{TP} x}{\mu_L}\right)^{0.87} \left(\frac{C_{p,L} \mu_L}{k_L}\right)^{0.4}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mulfloat

Viscosity of liquid [Pa*s]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

Developed for both vertical and horizontal flow, and flow patters of annular or mist annular flow. Steam-water and air-water were the only considered fluid combinations. Quality ranged from 0.1 to 1 in their data. [1] claimed an AAE of 17%.

References

1(1,2)

Davis, E. J., and M. M. David. “Two-Phase Gas-Liquid Convection Heat Transfer. A Correlation.” Industrial & Engineering Chemistry Fundamentals 3, no. 2 (May 1, 1964): 111-18. doi:10.1021/i160010a005.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Davis_David(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300, kl=.6,
... mul=1E-3)
1437.3282869955121
ht.conv_two_phase.Elamvaluthi_Srinivas(m, x, D, rhol, rhog, Cpl, kl, mug, mu_b, mu_w=None)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

hTPDkL=0.5(μGμL)0.25ReM0.7PrL1/3(μb/μw)0.14\frac{h_{TP} D}{k_L} = 0.5\left(\frac{\mu_G}{\mu_L}\right)^{0.25} Re_M^{0.7} Pr^{1/3}_L (\mu_b/\mu_w)^{0.14}
ReM=DVLρLμL+DVgρgμgRe_M = \frac{D V_L \rho_L}{\mu_L} + \frac{D V_g \rho_g}{\mu_g}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mugfloat

Viscosity of gas [Pa*s]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

Developed for vertical flow, and flow patters of bubbly and slug. Gas/liquid superficial velocity ratios from 0.3 to 4.6, liquid mass fluxes from 200 to 1600 kg/m^2/s, and the fluids tested were air-water and air-aqueous glycerine solutions. The tube inner diameter was 1 cm, and the L/D ratio was 86.

References

1

Elamvaluthi, G., and N. S. Srinivas. “Two-Phase Heat Transfer in Two Component Vertical Flows.” International Journal of Multiphase Flow 10, no. 2 (April 1, 1984): 237-42. doi:10.1016/0301-9322(84)90021-1.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Elamvaluthi_Srinivas(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300,
... kl=.6, mug=1E-5, mu_b=1E-3, mu_w=1.2E-3)
3901.2134471578584
ht.conv_two_phase.Groothuis_Hendal(m, x, D, rhol, rhog, Cpl, kl, mug, mu_b, mu_w=None, water=False)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

ReM=DVlsρlμl+DVgsρgμgRe_M = \frac{D V_{ls} \rho_l}{\mu_l} + \frac{D V_{gs} \rho_g}{\mu_g}

For the air-water system:

hTPDkL=0.029ReM0.87Prl1/3(μb/μw)0.14\frac{h_{TP} D}{k_L} = 0.029 Re_M^{0.87}Pr^{1/3}_l (\mu_b/\mu_w)^{0.14}

For gas/air-oil systems (default):

hTPDkL=2.6ReM0.39Prl1/3(μb/μw)0.14\frac{h_{TP} D}{k_L} = 2.6 Re_M^{0.39}Pr^{1/3}_l (\mu_b/\mu_w)^{0.14}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mugfloat

Viscosity of gas [Pa*s]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

waterbool, optional

Whether to use the water-air correlation or the gas/air-oil correlation

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

Developed for vertical pipes, with superficial velocity ratios of 0.6-250. Tested fluids were air-water, and gas/air-oil.

References

1

Groothuis, H., and W. P. Hendal. “Heat Transfer in Two-Phase Flow.: Chemical Engineering Science 11, no. 3 (November 1, 1959): 212-20. doi:10.1016/0009-2509(59)80089-0.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Groothuis_Hendal(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300, kl=.6,
... mug=1E-5, mu_b=1E-3, mu_w=1.2E-3)
1192.9543445455754
ht.conv_two_phase.Hughmark(m, x, alpha, D, L, Cpl, kl, mu_b=None, mu_w=None)[source]

Calculates the two-phase non-boiling laminar heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

hTPDkl=1.75(1−α)−0.5(mlCp,l(1−α)klL)1/3(μbμw)0.14\frac{h_{TP} D}{k_l} = 1.75(1-\alpha)^{-0.5}\left(\frac{m_l C_{p,l}} {(1-\alpha)k_l L}\right)^{1/3}\left(\frac{\mu_b}{\mu_w}\right)^{0.14}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval []

alphafloat

Void fraction in the tube, []

Dfloat

Diameter of the tube [m]

Lfloat

Length of the tube, [m]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

This model is based on a laminar entry length correlation - for a sufficiently long tube, this will predict unrealistically low heat transfer coefficients.

If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

Developed for horizontal pipes in laminar slug flow. Data consisted of the systems air-water, air-SAE 10 oil, gas-oil, air-diethylene glycol, and air-aqueous glycerine.

References

1

Hughmark, G. A. “Holdup and Heat Transfer in Horizontal Slug Gas- Liquid Flow.” Chemical Engineering Science 20, no. 12 (December 1, 1965): 1007-10. doi:10.1016/0009-2509(65)80101-4.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Hughmark(m=1, x=.9, alpha=.9, D=.3, L=.5, Cpl=2300, kl=0.6, mu_b=1E-3,
... mu_w=1.2E-3)
212.7411636127175
ht.conv_two_phase.Knott(m, x, D, rhol, rhog, Cpl=None, kl=None, mu_b=None, mu_w=None, L=None, hl=None)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

Either a specified hl is required, or Cpl, kl, mu_b, mu_w and L are required to calculate hl.

hTPhl=(1+VgsVls)1/3\frac{h_{TP}}{h_l} = \left(1 + \frac{V_{gs}}{V_{ls}}\right)^{1/3}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat, optional

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat, optional

Thermal conductivity of liquid [W/m/K]

mu_bfloat, optional

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Lfloat, optional

Length of the tube [m]

hlfloat, optional

Liquid-phase heat transfer coefficient as described below, [W/m^2/K]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

The liquid-only heat transfer coefficient will be calculated with the laminar_entry_Seider_Tate correlation, should it not be provided as an input. Many of the arguments to this function are optional and are only used if hl is not provided.

hl should be calculated with a velocity equal to that determined with a combined volumetric flow of both the liquid and the gas. All other parameters used in calculating the heat transfer coefficient are those of the liquid. If the viscosity at the wall temperature is not given, the liquid viscosity correction in laminar_entry_Seider_Tate is not applied.

References

1

Knott, R. F., R. N. Anderson, Andreas. Acrivos, and E. E. Petersen. “An Experimental Study of Heat Transfer to Nitrogen-Oil Mixtures.” Industrial & Engineering Chemistry 51, no. 11 (November 1, 1959): 1369-72. doi:10.1021/ie50599a032.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Knott(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300, kl=.6, mu_b=1E-3,
... mu_w=1.2E-3, L=4)
4225.536758045839
ht.conv_two_phase.Kudirka_Grosh_McFadden(m, x, D, rhol, rhog, Cpl, kl, mug, mu_b, mu_w=None)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

Nu=hTPDkl=125(VgsVls)0.125(μgμl)0.6Rels0.25Prl1/3(μbμw)0.14Nu = \frac{h_{TP} D}{k_l} = 125 \left(\frac{V_{gs}}{V_{ls}} \right)^{0.125}\left(\frac{\mu_g}{\mu_l}\right)^{0.6} Re_{ls}^{0.25} Pr_l^{1/3}\left(\frac{\mu_b}{\mu_w}\right)^{0.14}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mugfloat

Viscosity of gas [Pa*s]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

Developed for air-water and air-ethylene glycol systems with a L/D of 17.6 and at low gas-liquid ratios. The flow regimes studied were bubble, slug, and froth flow.

References

1

Kudirka, A. A., R. J. Grosh, and P. W. McFadden. “Heat Transfer in Two-Phase Flow of Gas-Liquid Mixtures.” Industrial & Engineering Chemistry Fundamentals 4, no. 3 (August 1, 1965): 339-44. doi:10.1021/i160015a018.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Kudirka_Grosh_McFadden(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300,
... kl=.6, mug=1E-5, mu_b=1E-3, mu_w=1.2E-3)
303.9941255903587
ht.conv_two_phase.Martin_Sims(m, x, D, rhol, rhog, hl=None, Cpl=None, kl=None, mu_b=None, mu_w=None, L=None)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

hTPhl=1+0.64VgsVls\frac{h_{TP}}{h_l} = 1 + 0.64\sqrt{\frac{V_{gs}}{V_{ls}}}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval []

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

hlfloat, optional

Liquid-phase heat transfer coefficient as described below, [W/m^2/K]

Cplfloat, optional

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat, optional

Thermal conductivity of liquid [W/m/K]

mu_bfloat, optional

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Lfloat, optional

Length of the tube [m]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

No specific suggestion for how to calculate the liquid-phase heat transfer coefficient is given in [1]; [2] suggests to use the same procedure as in Knott.

References

1(1,2)

Martin, B. W, and G. E Sims. “Forced Convection Heat Transfer to Water with Air Injection in a Rectangular Duct.” International Journal of Heat and Mass Transfer 14, no. 8 (August 1, 1971): 1115-34. doi:10.1016/0017-9310(71)90208-0.

2(1,2)

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Martin_Sims(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, hl=141.2)
5563.280000000001
>>> Martin_Sims(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300, kl=.6,
... mu_b=1E-3, mu_w=1.2E-3, L=24)
5977.505465781747
ht.conv_two_phase.Ravipudi_Godbold(m, x, D, rhol, rhog, Cpl, kl, mug, mu_b, mu_w=None)[source]

Calculates the two-phase non-boiling heat transfer coefficient of a liquid and gas flowing inside a tube of any inclination, as in [1] and reviewed in [2].

Nu=hTPDkl=0.56(VgsVls)0.3(μgμl)0.2Rels0.6Prl1/3(μbμw)0.14Nu = \frac{h_{TP} D}{k_l} = 0.56 \left(\frac{V_{gs}}{V_{ls}} \right)^{0.3}\left(\frac{\mu_g}{\mu_l}\right)^{0.2} Re_{ls}^{0.6} Pr_l^{1/3}\left(\frac{\mu_b}{\mu_w}\right)^{0.14}
Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

rholfloat

Density of the liquid [kg/m^3]

rhogfloat

Density of the gas [kg/m^3]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

mugfloat

Viscosity of gas [Pa*s]

mu_bfloat

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

If the viscosity at the wall temperature is not given, the liquid viscosity correction is not applied.

Developed with a vertical pipe, superficial gas/liquid velocity ratios of 1-90, in the froth regime, and for fluid mixtures of air and water, toluene, benzene, and methanol.

References

1

Ravipudi, S., and Godbold, T., The Effect of Mass Transfer on Heat Transfer Rates for Two-Phase Flow in a Vertical Pipe, Proceedings 6th International Heat Transfer Conference, Toronto, V. 1, p. 505-510, 1978.

2

Dongwoo Kim, Venkata K. Ryali, Afshin J. Ghajar, Ronald L. Dougherty. “Comparison of 20 Two-Phase Heat Transfer Correlations with Seven Sets of Experimental Data, Including Flow Pattern and Tube Inclination Effects.” Heat Transfer Engineering 20, no. 1 (February 1, 1999): 15-40. doi:10.1080/014576399271691.

Examples

>>> Ravipudi_Godbold(m=1, x=.9, D=.3, rhol=1000, rhog=2.5, Cpl=2300, kl=.6, mug=1E-5, mu_b=1E-3, mu_w=1.2E-3)
299.3796286459285
ht.conv_two_phase.h_two_phase(m, x, D, Cpl, kl, rhol=None, rhog=None, mul=None, mu_b=None, mu_w=None, mug=None, L=None, alpha=None, method=None)[source]

Calculates the two-phase non-boiling laminar heat transfer coefficient of a liquid and gas flowing inside a tube according to the specified method. Nine methods are available.

Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

rholfloat, optional

Density of the liquid [kg/m^3]

rhogfloat, optional

Density of the gas [kg/m^3]

mulfloat, optional

Viscosity of liquid [Pa*s]

mu_bfloat, optional

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

mugfloat, optional

Viscosity of gas [Pa*s]

Lfloat, optional

Length of the tube, [m]

alphafloat, optional

Void fraction in the tube, [-]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Other Parameters
methodstr, optional

A string of the function name to use, as in the dictionary conv_two_phase_methods.

Notes

It is difficult to compare correlations.

Examples

>>> h_two_phase(m=1, x=.9, D=.3, alpha=.9, rhol=1000, Cpl=2300, kl=.6, mu_b=1E-3, mu_w=1.2E-3, L=5, method='Aggour')
420.9347146885667
ht.conv_two_phase.h_two_phase_methods(m, x, D, Cpl, kl, rhol=None, rhog=None, mul=None, mu_b=None, mu_w=None, mug=None, L=None, alpha=None, check_ranges=True)[source]

Returns a list of correlation names for the case of two-phase non-boiling liquid-gas laminar flow heat transfer inside a tube.

Parameters
mfloat

Mass flow rate [kg/s]

xfloat

Quality at the specific tube interval [-]

Dfloat

Diameter of the tube [m]

Cplfloat

Constant-pressure heat capacity of liquid [J/kg/K]

klfloat

Thermal conductivity of liquid [W/m/K]

rholfloat, optional

Density of the liquid [kg/m^3]

rhogfloat, optional

Density of the gas [kg/m^3]

mulfloat, optional

Viscosity of liquid [Pa*s]

mu_bfloat, optional

Viscosity of liquid at bulk conditions (average of inlet/outlet temperature) [Pa*s]

mu_wfloat, optional

Viscosity of liquid at wall temperature [Pa*s]

mugfloat, optional

Viscosity of gas [Pa*s]

Lfloat, optional

Length of the tube, [m]

alphafloat, optional

Void fraction in the tube, [-]

check_rangesbool, optional

Whether or not to return only correlations suitable for the provided data, [-]

Returns
hfloat

Heat transfer coefficient [W/m^2/K]

Notes

A review of the correlations for which has the best performance has not been performed.

Examples

>>> h_two_phase_methods(m=1, x=.9, D=.3, alpha=.9, rhol=1000, Cpl=2300, kl=.6, mu_b=1E-3, mu_w=1.2E-3, L=5)[0]
'Aggour'