... of thermodynamics, thermal resistance (R th ) is used to investigate the resistance of any configuration to flow of heat comparing at same pumping power. Moreover, the second law of thermodynamics is applied to quantify the rate of entropy generation ( S ˙ gen ) and transport efficiency ( η t ) for MCHS...

... setup Fig. 5 Schematic of air-cooling LHP experimental setup Fig. 6 One key thermocouple position in cross section The whole thermal resistance of LHP ( R all ), from the chip to the condenser, is defined as (1) R all = T chip − T c Q...

... by 27–42%. e-mail:  mhazmy@kau.edu.sa 13 11 2018 14 08 2019 30 10 2019 hollow bricks natural convection in enclosures partitioned cavities numerical simulation finite volume method thermal resistance Summer outdoors temperatures in the city of Jeddah, Saudi...

... ) to form FP-OHP. DI water, ethanol, methanol, acetone, and FC-72 are investigated. The measured thermal resistance was strongly dependent on operational parameters. The optimum performance was observed with acetone with a charge ratio of 70% in the vertical orientation. The lowest thermal resistance...

... performance of mLHP. The minimum thermal resistance was found to be 0.38 °C/W with an acceleration rate of 4 g at a vibration frequency of 25 Hz (at a heat load of 120 W). The low-frequency vibration improves the mLHP performance under the longitudinal vibration loading. At higher heat loads, changing...

..., of surface area 150 × 420 mm 2 , and at lowering its mean temperature by transferring the heat to an adjacent heat sink of same dimensions. The PHP thermal resistance is measured at various heat transfer rates, condenser temperatures, and inclination angles. It decreases when the heat transfer rate increases...

... of galinstan is about half that of water and its viscosity is 2.5 times that of water, caloric, rather than convective, resistance is dominant. We analytically investigate the effect of using structured surfaces (SSs) to reduce the overall thermal resistance of galinstan-based microgap cooling in the laminar...

... parameters. In this trend, a new geometry is assumed and analyzed (by analytical or numerical methods) hoping to decrease the total thermal resistance of the system. Therefore, the objective of the present paper is to illustrate how to analyze a conductive cooling network and improve it using the analytical...

... of this work, or allow others to do so, for United States government purposes. 14 09 2012 11 07 2013 A noncontact, nondestructive neutron diffraction technique for measuring thermal resistance of buried material interfaces in bulk samples, inaccessible to thermocouple measurements...

... should remain constant and also it follows the trend in Ref. [ 30 ]. A sensitivity analysis is conducted to estimate the effect of the pore distribution on the heat transfer and the thermal resistances. Table 3 gives the results of the analysis, carried out by varying the pore diameter...

... and the significance of thermal contact resistance. A thermoreflectance measurement can be used with a valid heat transport model to experimentally quantify the contact thermal resistance of thin film interconnects. In the current work, a quasi-steady state thermoreflectance measurement is used to determine...

... , “ Measurement and Evaluation of the Interfacial Thermal Resistance Between a Metal and a Dielectric ,” Appl. Phys. Lett. , 93 ( 23 ), p. 231910 . 10.1063/1.3039806 4 Hopkins , P. E. , and Norris , P. M. , 2007 , “ Substrate Influence in Electron–Phonon Coupling Measurements in Thin Au...

... showed that applying the magnetic field on the water-based ferrofluid reduced the thermal resistance of PHP in all orientations. In the presence of a magnetic field, the best thermal performance was achieved at the higher charging ratios (70%) in all orientations. 01 02 2011 27 07 2011 21...

...A. Tamayol; K. Hooman Using a thermal resistance approach, forced convection heat transfer through metal foam heat exchangers is studied theoretically. The complex microstructure of metal foams is modeled as a matrix of interconnected solid ligaments forming simple cubic arrays of cylinders...

... applications. 21 12 2009 25 04 2011 11 08 2011 11 08 2011 chemically reactive flow copper design engineering flow measurement heat exchangers maintenance engineering nickel pipe flow thermal resistance velocity measurement fouling 90/10 Cu/Ni tube heat transfer...

...J. Ordóñez-Miranda; J. J. Alvarado-Gil In this work, transient heat transport in a flat layered system, with interface thermal resistance, is analyzed, under the approach of the Cattaneo–Vernotte hyperbolic heat conduction model using the thermal quadrupole method. For a single semi-infinite layer...

... geometry of a complex assembly of fins, i.e., an assembly where there is a cavity between the two branches of the T-Y-assembly of fins and two additional extended surfaces. The global thermal resistance of the assembly is minimized four times by geometric optimization subject to the following constraints...

... OHP had a much lower thermal resistance than the DI water OHP with the most effective heat transfer in the nanofluid OHP occurring in the slug flow regime. Khandekar , S. , and Groll , M. , 2004 , “ An Insight Into Thermo-Hydrodynamic Coupling in Closed-Loop Pulsating Heat Pipes ,” Int...

... transfer coefficients. Pressure drop measurements are correlated with the Darcy–Forcheimer relation. Empirical heat transfer correlations for the aluminum and carbon foam samples are provided. Using a hypothetical heat exchanger considering only the thermal resistance between the ambient air and the outer...

... predictions have demonstrated a very good comparison with previously published experimental data. By adding a radiative resistance to the model, improved performance predictions of overall thermal resistance/conductance were possible, leading to the extension of single layer analytical model to multiple...