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

Download

thesis_aykutsezmen_rev06.pdf

Date

2021-9

Author

Sezmen, Ramazan Aykut

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

365
views

223
downloads

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.

Subject Keywords

Thermal resistance network, Three-dimensional heat transfer, Multi-channel, Grooved heat pipe

URI

https://hdl.handle.net/11511/93231

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Numerical analysis of laminar forced convection with temperature-dependent thermal conductivity of nanofluids and thermal dispersion Özerinç, Sezer; Kakac, S. (2012-12-01) Nanofluids are promising heat transfer fluids due to their high thermal conductivity. In order to utilize nanofluids in practical applications, accurate prediction of forced convection heat transfer of nanofluids is necessary. In the first part of the present study, we consider the application of some classical correlations of forced convection heat transfer developed for the flow of pure fluids to the case of nanofluids by the use of nanofluid thermophysical properties. The results are compared with experi...
PERFORMANCE ASSESSMENT OF COMMERCIAL HEAT PIPES WITH SINTERED AND GROOVED WICKS UNDER NATURAL CONVECTION 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...
Modeling of multidimensional heat transfer in a rectangular grooved heat pipe / Odabaşı, Gülnihal; Dursunkaya, Zafer; Department of Mechanical Engineering (2014) Heat pipes are generally preferred for electronics cooling application due to large heat transfer capacity in spite of small size. Micro heat pipes use small channels, whose dimension is on the order of micrometers, to generate necessary capillary action maintaining fluid flow for heat pipe operation. In the present study a flat micro heat pipe with rectangular cross section is analyzed numerically. A simplified axial fluid flow model is utilized to find liquid-vapor interface shape variation along the heat...
Enhanced thermal conductivity of nanofluids: a state-of-the-art review Özerinç, Sezer; Yazicioglu, Almila Guevenc (2010-02-01) Adding small particles into a fluid in cooling and heating processes is one of the methods to increase the rate of heat transfer by convection between the fluid and the surface. In the past decade, a new class Of fluids called nanofluids, in which particles of size 1-100 nm with high thermal conductivity are Suspended in a conventional heat transfer base fluid, have been developed. It has been shown that nanofluids containing a small amount of metallic or nonmetallic particles, Such as Al2O3, CuO, Cu, SiO2,...
Performance of a flat grooved heat pipe with a localized heat load Sezmen, Ramazan Aykut; Çetin, Barbaros ; Dursunkaya, Zafer (2021-05-18) 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.