The numerical simulation and two kinds of experiments are conducted to investigate the thermal performance of several kinds of heat spreaders for high power memory module. For numerical study, commercial code, Flotherm, is used to model the 1GByte DDR memory module array. The convection heat transfer is analyzed for the memory module array with solid heat spreader under the airflow condition. F...

In light of a local thermal non-equilibrium model, fully developed forced convection in an annulus filled with a porous medium is treated to elucidate its exact temperature solutions for both fluid and solid phases. In this study, the plug-flow approximation is assumed since Darcian velocity over the cross-section is uniform except in a small region very close to the walls. The inner wall is he...

the universal thermal climate index (utci) addresses these shortcomings by using an advanced thermo-physiological model. the aim of this study was to investigate and prepare zoning of thermal comfort condition using utci. meteorological data including temperature, wind speed, cloudiness and relative humidity were obtained on a daily time scale from 10 synoptic stations during (2004-2013) period...

Fourier and hyperbolic models of heat transfer on a fin that is subjected to a periodic boundary condition are solved analytically. The differential equation in Fourier and non-Fourier models is solved by the Laplace transform method. The temperature distribution on the fin is obtained using the residual theorem in a complex plan for the inverse Laplace transform method. The thermal shock is ge...

In this study, we focused on the influence of indoor thermal comfort on the mere exposure effect while manipulating the Predicted Mean Vote (PMV). We used neutral random shapes as the stimuli and controlled exposure frequency (0, 1, 5, 10, and 15 times) and PMV (+2=hot,+1=warm,0,-1=cool -2=cold). After the acclimation phase, participants were exposed to each stimulus, and 5 min later, were aske...

Natural convection in an inclined porous cavity with positively or negatively inclined angles is studied numerically for time-periodic boundary conditions on the left side wall and partially active thermal boundary conditions on the right wall. The results show that a partially active thermal boundary condition on wall B can lead to heat transfer between two opposing vertical side walls. Temper...

We present the dynamics in thermally bistable medium by using onedimensional numerical calculations with cooling, heating, (realistic) thermal conduction, and physical viscosity. We set up a two-phase medium from thermally unstable one-phase medium and follow the long-term evolution of the medium. We focus on the spatial resolution because we have to resolve Field length λF that is the critical...

The effects of the bond coat species on the delamination or fracture behavior in thermal barrier coatings (TBCs) was investigated using the yclic thermal fatigue and thermal-shock tests. The interface microstructures of each TBC showed a good condition without cracking or delamination after flame thermal fatigue (FTF) for 1429 cycles. The TBC with the bond coat prepared by the air-plasma spray ...

In the present work, human thermal comfort is investigated within the built environment. The analysis is based on two building thermal simulation models. In the first one Nodal Network – the air condition (such as, air temperature and velocity) within each thermal zone is assumed uniform and therefore, all zone occupants are exposed to the same condition. In the second model – Nodal NetworkCFD ...

The acetylation of various alcohols and phenols was performed successfully using acetic anhydride in the presence of Citric acid coated magnetite nanoparticles as catalyst under solvent-free condition and at 45 °C. The catalyst showed high thermal stability and was recovered and reused at least 5 times without any considerable loss of activity. The present process is environmentally benign and ...