Analytical comparison of condensing flows inside tubes under Earth-gravity and space environments

Keshock, E. G.; Sadeghipour, M.S.

doi:10.1016/0094-5765(83)90022-x

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…Correlations used in designing condensers for space applications have been developed and tested in ground conditions only. However, it is known that the length of smooth in-tube condensers under microgravity conditions significantly exceeds that for the similar condensers in ground conditions (Keshok and Sadeghipour, 1983;Da Riva and Sanz, 1991). Together with theoretical modeling, quantitative experimental results are also needed.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of Convective Condensation Inside a Circular Tube

Marchuk

Lyulin

Kabov

2013

Interfac Phenom Heat Transfer

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This paper presents a theoretical modeling and numerical and experimental investigations of the laminar convective condensation inside a circular smooth tube. The developed model includes the interaction between the surface tension, gravity, and shear stresses at the vapor-liquid interface and its cross influence on heat transfer. The influence of the gravity force, tube diameter, and temperature drop on the heat transfer at in-tube condensation of pure ethanol vapor is considered. The heat transfer coefficient as a function of the inclination angle of the condenser tube and the temperature drop between the vapor saturation and the wall temperatures is measured. A comparison of the experimental and numerical data is performed. The results of the numerical calculation are in good agreement with the experimental results. Numerical experiments have been carried out with the aim of predicting the time length of the transition to the steady-state regime after an abrupt change of the gravity level. It is shown that the transition time to the steady-state regime increases with an increase in the diameter of the condenser tube. The transition time to the steady-state regime under microgravity conditions is longer than that under normal gravity for a tube with a diameter larger than the value close to the capillary length of the working liquid.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of Convective Condensation Inside a Circular Tube

Marchuk

Lyulin

Kabov

2013

Interfac Phenom Heat Transfer

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“…1. The experimental rig consists of the following components: test cell (1); high precision liquid pump (2); evaporator (3); cooling water liquid flow meter (4); working liquid flow meter (5); heating water liquid flow meter (6); personal computer (7); thermocouples (8); pressure sensor (9); vapor flow meter (10); pressure controller (11); vacuum pump (12); control and data acquisition system (13); CCD camera (14); heat insulated box (15); heater fan (16) Fig.1). The test cell with all monitoring sensors and devices is placed in the heat insulated casing (15 on Fig.1).…”

Section: Methodsmentioning

confidence: 99%

“…It is known that length of the smooth in-tube condenser under microgravity conditions significantly exceeds that for the similar condenser under ground conditions, [15,16]. Both, theoretical modelling and quantitative experimental results give a better understanding the physical phenomena and lead to correlations and design rules for the next generation of the space exploration of thermal control systems.…”

Section: Introductionmentioning

confidence: 99%

Condensation of HFE-7100 vapor in a loop heat pipe having a curvilinear fin

et al. 2017

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Abstract.Vapor condensation of the HFE-7100 in loop heat pipe was studied experimentally and theoretically. Numerical calculations of the vapor condensation on the curvilinear fin have been performed. Numerical, theoretical and experimental data are in a good agreement. Minimal condensate film thickness on the top of the fin has been determined and increases monotonously with the increase in the temperature drop.

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Conjugated Heat Transfer at Flow Condensation in Minchannel With Longitudinal Fins

Kabov

Marchuk

Legros

2004

ASME 2nd International Conference on Microchannels and Minichannels

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A mathematical model for vapor condensation in cylindrical longitudinally finned minichannel has been proposed taking into account all temperature non-uniformity. The model describes annular and rivulet flow regimes until complete grooves flooding. It is shown that when the model does not account for the wall heat conductivity the maximal calculated enhancement of heat transfer is predicted for the “sharp” trapezoidal fins. The most enhanced heat transfer in the case of non-isothermal fins has been obtained for the curvilinear fins of expanded Adamek’s parametric family. When reducing the heat conductivity the curvilinear fins become still more effective in comparison with the trapezoidal fins. The wall non-isothermity is a factor, which cannot be neglected when modeling condensation in a minichannels with finned surfaces.

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Analytical comparison of condensing flows inside tubes under Earth-gravity and space environments

Cited by 7 publications

References 4 publications

Theoretical and Experimental Study of Convective Condensation Inside a Circular Tube

Theoretical and Experimental Study of Convective Condensation Inside a Circular Tube

Condensation of HFE-7100 vapor in a loop heat pipe having a curvilinear fin

Conjugated Heat Transfer at Flow Condensation in Minchannel With Longitudinal Fins

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