Performance analysis of grooved heat pipes using 3-D multi-channel thermal resistance network

Sezmen, Ramazan Aykut
Heat pipes are phase change heat transfer devices that transfer high amounts of heat with low temperature differences compared to conventional cooling techniques due to their high thermal conductivity. Since heat pipes do not require any external power supply and not involve any moving parts, they are preferred for high reliability applications and in wide range of industrial applications from thermal management of electronics to space applications. Essentially, heat pipes use the advantage of occurring phase changes inside it and enable the movement of working fluid between its hot and cold ends. In the present study, thermal performance of flat grooved heat pipes (FGHP) for different design parameters and heat source and sink configurations are investigated. A three dimensional heat transfer model is developed using thermal resistance network analogy to simulate both conduction and phase change heat transfer. Coupled to thermal model, a one dimensional flow model is used to calculate change of radius of curvature and the velocity of the working fluid along the heat pipe’s longitudinal axis. Developed heat transfer and flow models are solved in a coupled way and an iterative solution procedure is followed until the energy and mass conservation are satisfied. Present three dimensional heat transfer model takes into consideration the lateral conduction heat transfer through the solid base material and allows to observe the effect of localized heat sources and sinks that do not entirely cover the width of FGHP. Crucial working parameters like wall temperatures all along the heat pipe, contact angle, vapor temperature and local hot spot regions are analyzed for local heat sources and sinks. Developed and validated models are used in a comprehensive study aiming to observe the effect of solid frame around the FGHP and in a parametric study investigating the effect of groove fin and width ratio for the same groove pitches.


Atay, Atakan; Sariarslan, Busra; Kuscu, Yigit F.; Saygan, Samet; Akkus, Yigit; Gurer, A. Turker; Cetin, Barbaros; Dursunkaya, Zafer (2019-01-01)
Heat pipes are widely used in thermal management of high heat flux devices due to their ability of removing high heat loads with small temperature differences. While the thermal conductivity of standard metal coolers is approximately 100-500 W/m.K, effective thermal conductivities of heat pipes, which utilize phase-change heat transfer, can reach up to 50,000 W/m.K. In industrial applications, commercially available heat pipes are commonly preferred by thermal engineers due to their low cost and versatility...
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Heat pipes are commonly preferred thermal management devices due to their rapid heat transfer characteristics, small size and reliability. It is crucial to design heat pipes that accurately match the requirements of the system to be thermally managed. In the present study, a numerical design and diagnosis simulation tool for heat pipes is developed and verified for grooved heat pipes. A modular heat pipe experimental setup is designed and manufactured. In order to decide on the geometric parameters of the h...
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Performance of a flat grooved heat pipe with a localized heat load
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Heat pipes are phase change heat transfer devices used in wide range of heat transport applications due to their high thermal transport capacities with low temperature differences. Heat pipes are especially preferred for electronic cooling applications and aerospace avionics to satisfy high heat transfer rate requirements. In this study, heat transfer and phase change mechanisms of working fluid are investigated and modeled using a 3-D thermal resistance network for multichannel flat grooved heat pipes. Fir...
Citation Formats
R. A. Sezmen, “Performance analysis of grooved heat pipes using 3-D multi-channel thermal resistance network,” M.S. - Master of Science, Middle East Technical University, 2021.