Abstract
Heat pipes provide highly efficient heat transfer and are powerful tools in thermal management systems. In contrast to most established systems, heat pipes operating within moving systems such as electric vehicles or machine tools are exposed to unsteady acceleration forces. In order to guarantee proper heat pipe function in scenarios involving accelerated movement, it is necessary to examine the effect of acceleration forces on the heat pipe behavior. This paper presents experimental investigations on the thermal performance of translationally moving heat pipes. The designed experimental set-up consists of a measurement platform mounted to a linear direct drive. By obtaining the temperature gradient between evaporator and condenser section, the thermal resistance of heat pipes is determined at standstill and under linear motion. The experiments were conducted using heat pipes with sintered, mesh and grooved wicks. The results demonstrate the motion influence on the thermal resistances depending on the heat pipe orientation and heat input.
Highlights
Heat pipes are passive heat transfer devices with very low thermal resistance
Experimental investigations were carried out to study the effect of translational acceleration on the thermal performance of heat pipes with different capillary structures
An experimental set-up was used to obtain the thermal resistance of a sintered wick heat pipe, a grooved wick heat pipe and a composite wick heat pipe under varying heat loads at different inclination angles
Summary
Heat pipes are passive heat transfer devices with very low thermal resistance. The effective thermal conductivity of heat pipes can reach up to the order of 105 W/(m K) [1, 2]. The exceptional heat transfer characteristics of heat pipes are based on a two-phase cycle of a working fluid within a hermetically sealed, typically tubular vessel. Heat applied to one side of the heat pipe (evaporator) leads to the vaporization of the working fluid. The heat pipe contains a wick structure providing a capillary pressure that forces the liquid phase back to the evaporator section. Heat pipes are used in a wide variety of application fields. A novel field of heat pipe research is the thermal error compensation in machine tools. While heat losses in the machine tool can be transferred by heat storage components on a timely scale, heat pipes can be used to create thermal connections between different machine parts, heat storage components and cooling elements
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