D113 Fundamental Study on Heat Transport Device Using a Sound Wave (original) (raw)
C142 Investigation of Serious Thermal Resistance in 3D-Integrated Package by Thermal Network Method
Netsu Kogaku Konfarensu koen ronbunshu, 2010
In thc dream chip pr〔) ject of ASET ， 3D −integrated chip is developed． The chip has multi layered structure and heat genoration dcnsity in tlle cllip bccomes much Iarger than conventional sing ［ e layered chip ． Therefbre ， therrnal design of the chip is very important ． Sin じ e the dream chip is complcx structure and there exig． t so many parameters fbr thennal design ， thermal design with CFD takes bng time ． ln this study ， wc applicd therma ［network analysis to the thermal design of the chip and discussed the reduction of the therinal resistance inside the chip Key ' Words ：Thermal network method ． Therlnal resistance ， 3D − integrated chip
Study on Natural Convection Cooling of Electronic Equipment
IEEE Transactions on Software Engineering, 2007
In this study, the natural cooling of electronic equipments has been studied experimentally. The natural convection between two vertical walls modeling printed circuit boards was investigated. Velocity fields between the walls were measured using a PIV and a cooling capacity was estimated as functions of the board spacing and a heating power. It was found that the cooling capacity was small when the board spacing was less than 10mm under the condition examined. Measured velocity profiles were compared with available analytical and experimental data and the validity of the PIV measurement was confirmed.
1976
The time-dependent behaviours of the shallow fiow of hot fire products were studied by using the full scale corridors of different size (A : 13 m(L) x I .5 m(B) x 2.5 m(H), B : 70 m(L) x 3,3 m(B) x 1.8 m(H)) and by taking the wood cribs as the model fire source. Those cribs were placed at the end of both corridors and were ignited by a small pilot-fiame at the center of their bottoms to obtain the similarity for the growth of flame. The weight and maximum burning rate of the cribs were 5 kg and 20 kg, 5 g/sec and 20 g/sec for A and B corridor respectively. The smoke concentration (Cs) was defined by the turbidity in unit of l/m. The gas concentrations were represented by th~ output of the gas-sensor (Cg) in unit of mV which were feasibly replaced by [CO] in the combustion gases in terms of the calibration curve. By taking CO as a labelled gas, the concentration of C02 were estimated from Cg on the basis of [CO]l[C02] at the fire source which were obtained the high precision I. R. me...
The Proceedings of the Symposium on the Motion and Vibration Control
Recent years， a system design me 血 od bascd on 血 e idea of lDCAE is proposed ． 1DCAE provides 止 e idea to p 曲 m the syste皿 design in manufacturing eHl 丘vely and e 册 ciend 払 These ideas realize the design site ofmanufacturing in a natural way ． However ， it is not a situation in which the idea can be educated in the field of education since 匸 he idea does not provide as a scholarly framework ． Therefbre， based on the idea of IDCAE ， we aim to develop an educational tool that can realize a part of dlese ideas through al 】 exa 皿 Ple of control system design ． This paper introduces an exarnple of development of an educationa1 tool by using a torsional vibration system ．
Heat Transfer Enhancement of a Low-Profile Block in a Channel Flow at Low Air-Velocity
Transactions of the Japan Society of Mechanical Engineers. B, 2005
investigation was preformed to enhance the heat transfer from a low-profile block placed in a channel flow at low duct Reynolds number of below 1000. The inflowing air to the heated block was accelerated due to the contraction effect by setting a barrier on the ceiling of the channel. The input electric-power to the cooling fan was kept constant, i.e., the flow rate decreases with increasing the pressure loss. The heat transfer from the heated block was dramatically increased in the conditions for which the flow reattachment on the top face of the block occurred as a result of the flow acceleration at the gap of the barrier. This method is particularly effective when the fan is operating at low loading conditions. If heated blocks are placed locally in a channel, the method using a barrier, which accelerates the flow directly around the blocks without increasing the flow rate, results in the less use of the fan power (pumping power) to achieve the heat transfer enhancement.
Wave Propagation Across Solid-Fluid Interface With Fluid-Structure Interaction
Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Competition and 23rd Annual Student Paper Competition; ASME NDE Division, 2015
This paper reports on investigations conducted with a view towards developing a theoretical model for wave propagation across solid-fluid interfaces with fluid-structure interaction. Although many studies have been conducted, the mechanism of wave propagation close to the solid-fluid interface remains unclear. Consequently, our aim is to clarify the mechanism of wave propagation across the solid-fluid interface with fluid-structure interaction and develop a theoretical model to explain this phenomenon. In experiments conducted to develop the theory, a free-falling steel projectile is used to impact the top of a solid buffer placed immediately above the surface of water within a polycarbonate tube. The stress waves created as a result of the impact of the projectile propagated through the buffer and reached the interface of the buffer and water (fluid) in the tube. Two different buffers (polycarbonate and aluminum) were used to examine the interaction effects. The results of the expe...
The transactions of the Institute of Electrical Engineers of Japan.C, 2004
A radio wave absorber using an Indium Tin Oxide (ITO) resistive-film, a metal plate as a reflection plate and two layers of dielectric plate is proposed. We herein examine the wide-angle absorption characteristics of the absorber under TE and TM polarization waves, theoretically and experimentally. In this structure, two layers of the dielectric plate are arranged in front of the resistive-film for the absorption film under the condition that the permittivity and thickness are chosen accurately. As a result, realization of the absorber for TE and TM polarization waves is confirmed theoretically. Moreover, the absorption of 20dB or more can be obtained based on the designed values of the proposed absorber under the incident angle ranging from 0 to 47.5 degrees for TE and TM polarization waves.