Loop Heat Pipe with Several Evaporators

Goncharov, K. A.; Golovin, O.; Колесников, В. А.

doi:10.4271/2000-01-2407

Cited by 20 publications

(3 citation statements)

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“…The feasibility of a multiple-evaporator LHP has been demonstrated [2][3][4][5]. There are several challenges for such a system.…”

Section: Introductionmentioning

confidence: 99%

Capillary Limit in a Loop Heat Pipe with Dual Evaporators

Ku¹,

Birur²

2002

SAE Technical Paper Series

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This paper describes a study on the capillary limit of a loop heat pipe (LHP) with two evaporators and two condensers.Both theoretical analysis and experimental investigation are conducted.Tests include heat load to one evaporator only, even heat loads to both evaporators and uneven heat load to beth evaporators. Results show that after the capillary limit is exceeded, vapor will penetrate through the wick of the weaker evaporator and the compensation chamber (CC) of that evaporator will control the loop operating temperature regardless of which CC has been in control prior to the event Because the evaporator can tolerate vapor bubbles, the loop may continue to work and reach a new steady state at a higher operating temperature. The loop may even function with a modest increase in the heat load past the capillary limit With a heat load to only one evaporator, the capillary limit can be identified by rapid increases m the operating temperature and in the temperature difference between the evaporator and the CC. However, it is more difficult to tell when the capillary limit is exceeded if heat loads are applied to both evaporators. In all cases, the loop can recover by reducing the heat load to the loop.

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“…The feasibility of a multiple-evaporator LHP has been demonstrated [2][3][4][5]. There are several challenges for such a system.…”

Section: Introductionmentioning

confidence: 99%

Capillary Limit in a Loop Heat Pipe with Dual Evaporators

Ku¹,

Birur²

2002

SAE Technical Paper Series

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“…The increase of the operating temperature with the elevation can be explained as follows. As the pressure difference across the evaporator wick increases due to gravity head, the difference in saturation temperatures must also increase, as dictated by equation (5). Since the liquid enthalpy entering the compensation chamber does not change, the only way to satisfy the increasing pressure drop is by an increase in the evaporator vapor temperature.…”

Section: Gravity Effectsmentioning

confidence: 99%

Capillary Limit of a Miniature Loop Heat Pipe with Multiple Evaporators and Multiple Condensers

Nagano

2006

9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

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An experimental investigation of a miniature loop heat pipe with multiple evaporators and multiple condensers were conducted in order to evaluate its capillary limit. The experimental tests were conducted by varying heat load to one or both evaporators, with and without active temperature control of compensation chamber (CC) using the thermoelectric devices, and variable tilts between the evaporators and the CCs. The physical process of the loop and thermal conductance of the heat leak from evaporator to (CC) were discussed based on the test results. The difference of the temperature profiles between with and without active control of CC temperature was evaluated. The effect of the gravity on capillary limit and CC temperature was also evaluated by comparing the test result in horizontal position with that in vertical position. The loop recovery after capillary limit was exceeded was also described. Nomenclaturethermal conductance between the evaporator and the CC mass flow rate capillary pressure heat leak heat load to evaporator radius of curvature of the wick at the vaporlliquid interface CC temperature vapor temperature in the evaporator grooves total pressure drop in LHP difference in specific volume between the liquid and vapor phases surface tension force latent heat of vaporization of the working fluid contact angle between the liquid and solid

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“…About 20 nodes were used in their analysis and an implicit iteration technique was utilized to solve governing equations at each time step. Goncharov et al [11] reported the experimental results of the thermal performance of loop heat pipes with two and three evaporators. Nagano and Ku [12] reported the experimental results of thermal performance and capillary limit of heat transfer of a loop heat pipe with two evaporators by changing heat loads of evaporators and inclination of the heat pipe.…”

Section: Introduction mentioning

confidence: 99%

Heat Transfer and Flow Analysis in Loop Heat Pipe with Multiple Evaporators Using Network Model

Hirasawa¹,

Kawanami²,

Shirai³

2016

JMEA

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Thermal performance of a loop heat pipe with two evaporators and two condensers was examined using a lumped network model analysis. Thermosyphon-type vertical loop heat pipe and capillary-pump-type horizontal loop heat pipe were calculated by examining the change of heating rate of two evaporators. Calculation results showed that the vapor and liquid flow rates in the loop heat pipe and the thermal conductance of the heat pipe changed significantly depending on the distribution ratio of the heating rate of the multiple evaporators. The thermal performance of the vertical loop heat pipe with two evaporators was also examined and experimental results of flow direction and thermal conductance of the heat pipe agreed with the analytical results. The lumped network model analysis is therefore considered accurate and preferable for the practical design of a loop heat pipe with multiple evaporators.

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Loop Heat Pipe with Several Evaporators

Cited by 20 publications

References 0 publications

Capillary Limit in a Loop Heat Pipe with Dual Evaporators

Capillary Limit in a Loop Heat Pipe with Dual Evaporators

Capillary Limit of a Miniature Loop Heat Pipe with Multiple Evaporators and Multiple Condensers

Heat Transfer and Flow Analysis in Loop Heat Pipe with Multiple Evaporators Using Network Model

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