Masaaki Okuyama

Simple measuring method of thermal conductivity of silicone grease and effect of carbon nanomaterials on its thermal conductivity

In the electronic equipment like personal computers with high heat fluxes for instance, the thermal contact resistance plays an important role in its cooling system. To attain high cooling performance, some kind of grease is often introduced between a heat source and a heat sink. In the present study, a simple method for thermal conductivity measurement of grease has been proposed and confirmed its validity by using greases with known thermal conductivity. From a series of measurements, the validity of the present measuring method has been confirmed. Further, the effect of the addition of carbon nanomaterials on the thermal conductivity of silicone grease has been investigated, and its quantitative relation has been clarified.Copyright

Visualization of Numerical Analysis Process oy Excel - Method of Increase and Decrease in Number of Space Division for One and Two- Dimensional Steady-State Analyses -

Visualization of Numerical Analysis Process oy Excel ——Method of Increase and Decrease in Number of Space Division for One and TwoDimensional Steady-State Analyses 一 Toshio T O M I M U R A , Yasushi K O I T O , Shuichi T〇RII Shigeki H I R A S A W A , and MasaaKi O K U Y A M A A B S T R A C T I n the numer i ca l analysis us ing Excel, each cell can be regarded as a nodal point , and calculat ions are per fo rmed by us ing equat ions w r i t t e n i n those cells w i t h o u t m a k i n g any programs. Fu r t he rmore , a concrete image or a computa t ion doma in corresponding to the phys ica l model can be d r a w n d i rec t l y on the soreadsheet, and by doing such classif icat ion as color ing boundary ana in te r io r cells, w r i t i n g and debugging are v isua l ly conducted w i t h ease. Moreover, the calculated resul ts shown i n the computa t iona l domain are immed ia te ly v isual ized us ing the Char t Wizard. I n the present study, a method of increase and decrease i n number of space divis ion, wh ich is essent ia l to per fo rm p rac t i ca l calculat ions, has been shown for one and two-d imensional steady*state heat conduct ion problems.

The Recycling Technology and Utilization of Waste-Wood. Heat Recovery and Utilization of the Walnut Charcoal.

This research tried resource recovery of the waste wood and effective utilization. In our study, we used walnut as waste wood. We distillated walnut in dry distillation boiler, changed walnut charcoal. Then, we recovered heat energy that is generated in the time, and attempted the effective utilization of energy. And, we utilized the property of the charcoal of the porous body, produced walnut charcoal as an inner-wall breathing material, and tired the improvement in the indoor environment. The conclusion were as follows; 1)If we distilled walnut, we produce walnut charcoal, which is 28% of the walnuts mass in simple distillate experiment. 2)If we distilled walnut, we produce walnut charcoal, which is 15% of the walnuts mass in dry distillation boiler. 3)The heat recovery rate of dry distillation boiler is 17%. The heat recovery of walnut produce 5.26 [MJ/kg], which is 12% of the quantity of heat of walnut. 4)Inner-wall breathing material of walnut charcoal have dehumidification and spout moisture effect. 5)Inner-wall breathing material of walnut char-coal cut indoor overall heat transfer coefficient for 55%. 6)Inner-wall breathing material of walnutcharcoal has aerial purification performance by the residual wood vinegar component in the inside the walnut charcoals.

Study of Heat Pump System using Stored Ground Water : The Effect of Iron Rust upon Heat Transfer and Iron Lump Removal Method within Heat Exchanger

This paper describes an experimental and observational study of iron rust removal method and iron lump formation mechanism within a heat exchanger of a small type heat pump. Since a heat exchanger of a heat pump using water is corroded, heat transfer coefficient (in other words, C.O.P.) is decreased. In this study, iron rust removal system was proposed and cleared the effectiveness. Moreover, iron lump formation mechanism was clarified by an experiment with a double pipe heat exchanger. The conclusions were as follows. 1.C.O.P. of a small type heat pump was recovered by the iron rust removal system. 2.C.O.P. decrease of a heat pump is caused by iron lump grown within a heat exchanger. The source of this iron lump is not the iron rust including water, but the iron rust produced from a heat exchanger.