Effective thermal conductivity of heat pipes

Numerical research is carried out on the cooling performance of an aircraft electromechanical actuator (EMA) using heat pipes. The theoretical model is established to describe the heat transfer processes in the EMA, which is validated by comparing the numerical and experimental results. The heat transfer characteristics of the EMA using two different cooling methods, heat pipes-fuel and heat pipes-ram air, are studied by numerical simulation. For the heat pipes-fuel cooling method, impact of the coolant flow velocity (0–0.015 m/s) on the cooling performance of the EMA is studied, based on which fins are designed on the condenser of heat pipes to improve the cooling performance. The results show that it is an efficient way to cool the electromechanical actuator with heat pipes-fuel cooling method and the heat dissipation rate of the EMA can be improved by 28.8% by using fins. In addition, the heat pipes-ram air cooling method could cool the EMA efficiently with the ram air temperature properly controlled.

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“…Heat pipes are regarded as solids, and the heat transfer performance is characterized by the effective thermal conductivity of heat pipes. 20…”

Section: Numerical Methods Of the Emamentioning

confidence: 99%

“…(1) Heat pipes are regarded as solids, and the heat transfer performance is characterized by the effective thermal conductivity of heat pipes. 20 (2) Assume that the fuel is at three-dimensional (3D) steady state. Though the change of aircraft flight attitude will cause the fuel sloshing and shocking the walls of fuel tanks.…”

Section: Theoretical Modelmentioning

confidence: 99%

Numerical research on the cooling performance of an aircraft electromechanical actuator based on heat pipes-fuel and heat pipes-ram air cooling conception

Lian

Zhang

Wan

2022

Advances in Mechanical Engineering

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A Comprehensive Review of Thermal Performance Improvement of High-Temperature Heat Pipes

Chen,

Zhou,

Zhou

et al. 2024

J. Therm. Sci.

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Thermal Performance Maps for Forced Air Cooling of Ruggedized Electronics Enclosures

VanEngelenhoven

Solbrekken

Geisler

2007

ASME 2007 InterPACK Conference, Volume 2

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Based on standard commercial form factors, this study explores chassis-level air cooling limits for ruggedized military electronics enclosures constrained by pressure drop requirements and fin manufacturing capabilities. Numeric and analytic models are developed and used to define a methodology for optimizing the geometry of longitudinal plate fins included in side wall ducts to maximize the amount of heat that can be dissipated from an air-cooled chassis. The results of these analyses are presented in the form of a performance map facilitate the identification of particular fin manufacturing process well-suited for a specified set of mass flow, pressure drop, and heat transfer requirements. Analysis results demonstrate that if isothermal boundaries can be achieved, the heat transfer capacity of the chassis will increase relative to isoflux boundary condition assumptions. As a means to this end, the incorporation of heat pipes into the chassis wall is explored to enhance heat spreading and approach the isothermal limits of heat dissipation in the airflow ducts.

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Effective thermal conductivity of heat pipes

Cited by 3 publications

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Numerical research on the cooling performance of an aircraft electromechanical actuator based on heat pipes-fuel and heat pipes-ram air cooling conception

Numerical research on the cooling performance of an aircraft electromechanical actuator based on heat pipes-fuel and heat pipes-ram air cooling conception

A Comprehensive Review of Thermal Performance Improvement of High-Temperature Heat Pipes

Thermal Performance Maps for Forced Air Cooling of Ruggedized Electronics Enclosures

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