Modeling of multidimensional heat transfer in a rectangular grooved heat pipe /

Odabaşı, Gülnihal
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 pipe axis through Young-Laplace equation. Three dimensional steady heat transfer model both in solid and fluid domain is coupled with flow equation. A coordinate transformation is applied for the heat transfer analysis in fluid domain, since the physical domain has an irregular shape along the heat pipe axis. Phase change heat transfer is introduced to the study as a boundary condition, where evaporation and condensation models at the liquid-vapor interface are solved. Heat transfer equation in liquid domain includes convection, which is generally neglected and the effect of the convection on heat pipe performance is investigated. The study is performed to investigate the effect of physical dimension of heat pipe and boundary condition on the performance of the heat pipe. Also a sample study simulating the cooling of an electronic component is conducted to define the groove size according to the defined maximum operating temperature.


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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 pha...
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Saygan, Samet; Dursunkaya, Zafer; Çetin, Barbaros; Department of Mechanical Engineering (2021-2-24)
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Çağlar, Ahmet; Yamalı, Cemil; Baker, Derek Keıth; Department of Mechanical Engineering (2012)
Poor heat and mass transfer inside the adsorbent bed of thermal wave adsorption cooling cycles cause low system performance and is an important problem in the adsorbent bed design. In this thesis, a new adsorbent bed is designed, constructed and tested to increase the heat and mass transfer in the adsorbent bed. The adsorbent bed is constructed from a finned tube in order to enhance the heat transfer. Additionally, the finned bed geometry is theoretically modeled and the model is solved time dependently by ...
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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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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...
Citation Formats
G. Odabaşı, “Modeling of multidimensional heat transfer in a rectangular grooved heat pipe /,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.