Steady Two-Dimensional Heat and Mass Transfer in the Vapor-Gas Region of a Gas-Loaded Heat Pipe

1973 ◽  
Vol 95 (3) ◽  
pp. 377-382 ◽  
Author(s):  
A. R. Rohani ◽  
C. L. Tien
Keyword(s):  
Mass Transfer ◽  
Heat Pipe ◽  
Heat And Mass Transfer ◽  
Species Conservation ◽  
Heat Pipes ◽  
Mass Conservation ◽  
Gas Diffusion ◽  
Two Dimensional ◽  
Axial Conduction ◽  
Thermodynamic Equilibrium Condition

A numerical analysis is made of the steady two-dimensional heat and mass transfer in the vapor-gas region of a gas-loaded heat pipe. Consideration is given to a cylindrical heat pipe with typical evaporator, condenser, and noncondensible-gas sections and with negligible axial conduction through the wall and the liquid-wick matrix. The elliptical mass, momentum, energy, and species conservation equations have been solved in conjunction with the overall energy and mass conservation constraints and the thermodynamic equilibrium condition for three heat pipe cases with different working fluids and diameters. The results show that in certain gas-loaded heat pipes, such as liquid-metal heat pipes, vapor-gas diffusion and two-dimensionality must be considered in the analysis. Extension of the present numerical framework to more general cases such as including the axial wall conduction is indicated.

scholarly journals Heat and Mass Transfer in the Vicinity of the Vapor-Gas Front in a Gas-Loaded Heat Pipe

1972 ◽  
Vol 94 (2) ◽  
pp. 155-162 ◽  
Author(s):  
D. K. Edwards ◽  
B. D. Marcus
Keyword(s):  
Mass Transfer ◽  
Heat Pipe ◽  
Heat And Mass Transfer ◽  
Heat Pipes ◽  
Mass Diffusion ◽  
Working Fluid ◽  
Predictive Capability ◽  
Axial Mass ◽  
Axial Heat ◽  
And Control

An analysis is presented of axially conducting gas-controlled heat pipes leading to a predictive capability for the heat and mass transfer along the heat pipe. In addition, experimental results are presented which verify the analysis, and computational results are presented which show the relative influence of various parameters which affect the system behavior. In particular it was found that axial heat conduction is of much greater importance than axial mass diffusion in establishing the wall temperature profiles and condenser heat-transfer characteristics of gas-loaded heat pipes. However, mass diffusion and, consequently, the choice of working fluid and control gas are of considerable importance in establishing the “diffusion freezeout rate” if the potential exists for freezing of vapor which penetrates the gas-blocked portion of the condenser. It is believed that the analysis and associated computer program are useful tools for designing gas-loaded heat pipes.

scholarly journals Mathematical Modeling of Heat and Mass Transfer in Heat Pipes in a One-Dimensional Formulation when Cooling Active Phased Antenna Arrays

2021 ◽  
Vol 15 ◽  
pp. 196-203
Author(s):  
S. Radaev
Keyword(s):  
Mass Transfer ◽  
Heat Pipe ◽  
Heat And Mass Transfer ◽  
Antenna Arrays ◽  
Saturation Temperature ◽  
Heat Pipes ◽  
Equilibrium Temperature ◽  
One Dimensional ◽  
Phased Antenna Arrays ◽  
The Mathematical Model

The work proposes test one-dimensional models of heat and mass transfer in heat pipes during cooling of active phased antenna arrays, which can be used in processing the test results of flat heat pipes in order to determine their performance characteristics and identify the parameters required for modeling in a more complex setting (for example, in flat and taking into account the presence of several localized sources of heat supply). To take into account the influence of the heat release power on the equilibrium temperature inside the heat pipe, the model has been added to take into account the dependence of the steam saturation temperature on the pressure, which is realized inside the steam pipeline when the heat pipe is heated. Numerous calculations carried out made it possible to refine the mathematical model. In particular, a significant effect on the temperature distribution along the heat pipe is shown, taking into account the dependence of the steam saturation temperature on the pressure in the parawire. It is shown that the introduction of standard functions for the characteristics of the coolant (water) in the liquid and vapor state, as well as taking into account the capillary pressure on temperature, makes it possible to refine the resulting solution.

Experimental study of heat and mass transfer in a cryogenic heat pipe

1975 ◽  
Vol 28 (1) ◽  
pp. 19-21 ◽  
Author(s):  
L. L. Vasil'ev ◽  
V. G. Kiselev ◽  
M. A. Litvinets ◽  
A. V. Savchenko
Keyword(s):  
Mass Transfer ◽  
Experimental Study ◽  
Heat Pipe ◽  
Heat And Mass Transfer

Heat and mass transfer in heat pipes with noncondensing gas

1973 ◽  
Vol 25 (2) ◽  
pp. 988-992
Author(s):  
L. L. Vasil'ev ◽  
S. V. Konev
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Heat Pipes

scholarly journals Numerical simulation of heat and mass transfer in a 3D model of a loop heat pipe evaporator

2017 ◽  
Vol 3 (3) ◽  
pp. 210-217 ◽  
Author(s):  
Aleksey A. Pozhilov ◽  
Dmitri K. Zaitsev ◽  
Evgueni M. Smirnov ◽  
Aleksander A. Smirnovsky
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat Pipe ◽  
Heat And Mass Transfer ◽  
3D Model ◽  
Loop Heat Pipe

Numerical Study on Flow and Heat and Mass Transfer in Pulsating Heat Pipe

2019 ◽  
Author(s):  
Jian-Hong Liu ◽  
Fu-Min Shang ◽  
Nikolay Efimov
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat Pipe ◽  
Gas Phase ◽  
Heat And Mass Transfer ◽  
Mixture Model ◽  
Volume Fraction ◽  
Pulsating Heat Pipe ◽  
Two Phase ◽  
Pipe Model

Abstract Numerical simulation was performed to establishing a two-dimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the Mixture and Euler models, which were unsteady models of vapor-liquid two-phase, based on the control-volume numerical procedure utilizing the semi-implicit method. Through comparing and analyzing the volume fraction and velocity magnitude of gas phase to decide which model was more suitable for numerical simulation of the pulsating heat pipe in heat and mass transfer research. It was showed there had gas phase forming in stable circulation flow in the heating section, the adiabatic section using the Mixture and Euler models respectively, and they were all in a fluctuating state at 10s, besides, the pulsating heat pipe had been starting up at 1s and stabilizing at 5s, it was all found that small bubbles in the heat pipe coalescing into large bubbles and gradually forming into liquid plugs and gas columns from the contours of volume fraction of the gas phase; through comparing the contours of gas phase velocity, it could be seen that there had further stably oscillating flow and relatively stabler gas-liquid two-phase running speed in the pulsating heat pipe used the Mixture model, the result was consistent with the conclusion of the paper[11] extremely, from this it could conclude that the Mixture model could be better simulate the vaporization-condensation process in the pulsating heat pipe, which could provide an effective theoretical support for further understanding and studying the phase change heat and mass transfer mechanism of the pulsating heat pipe.

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