Browsing by Subject "Flat grooved heat pipe"

Now showing 1 - 2 of 2

Embargo
Comprehensive three-dimensional hydrodynamic and thermal modeling of steady-state operation of a flat grooved heat pipe
(Elsevier Ltd, 2023-12-22) Gökçe, G.; Kurt, Cem; Odabaşı, G.; Dursunkaya, Z.; Çetin, Barbaros
Mathematical modeling of grooved heat pipes is a challenging task since multiple coupled physical phenomena such as phase change, free-surface flow and heat transfer are involved. Moreover, the fact that the shape of the liquid–vapor interface in the heat pipe is unknown a priori requires simultaneous determination of the interface variation as a part of the solution procedure, a capability currently not addressed in commercially available engineering CFD tools. In this study, a multi-dimensional and multi-scale computational model is presented to gain a comprehensive understanding of the underlying physics of grooved heat pipes. The computational model is based on an iterative scheme for the solution of 3D heat transfer and liquid flow, interface phase change heat transfer (evaporation and condensation) and shape of the interface. The model is implemented using three different methodologies two of which utilize commercial engineering CFD software. The results are verified for a problem previously studied in the literature which indicates the robustness of our computational approach.
Open Access
Thermal performance characterization of flat grooved heat pipes
(2017-07) Alijani Alijanvand, Hossein
Heat pipes are promising heat removal devices widely used in a variety of elds ranging from thermal management of electronic components to terrestrial and aerospace applications. Their working principle, phase change of a working uid, makes them superior to other conventional cooling methods. This thesis study focuses on at grooved heat pipes and the e ects of working uid, lling ratio, groove density, and input heat ux on their thermal performance are investigated. During the study, two aluminum heat pipe generations and one silicon heat pipe con guration, each having a set of di erent groove densities, are fabricated. In each set, di erent methods of heating and cooling are applied. In all the experiments on aluminum heat pipes, the working uid is isopropyl alcohol due to its wetting characteristics that makes it compatible with the aluminum surface. For the case of silicon, the heat pipes are charged with isopropyl alcohol and water. The optimum lling ratio, corresponding to the minimum temperature di erence along the heat pipe and maximum e ectiveness, is reported for each heat pipe. Moreover, as one of the operational limitations of heat pipes, the occurrence of dryout is visually observed and its extent is reported for each heat pipe operating at di erent lling ratios under di erent heat inputs. Furthermore, to nd the heat input to the heat pipes of rst generation and to simulate the phase change in one of the heat pipes of second generation, two 3-D computational models are developed and temperature distribution along the heat pipes are veri ed by the experimental results.