G301 DRIVE MECHANISM OF HEAT TRANSFER ENHANCEMENT IN A FLUID LAYER HEATED FROM ABOVE(Heat transfer enhancement)
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概要
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Driving device for heat transfer enhancement in a fluid layer heated from above was developed. The device was composed of a coil spring made of shape memory alloy and a closed vessel that is flexible in axial direction. This device works as a negative thermal expansion object. It shrinks and sinks under water when it is hot, and it expands and floats on water when it is cold. Its performance depends on a delicate relation between effective density of the device and density of surrounding water. The device has a characteristic that the closed vessel was not composed of a cylinder-piston structure. Unfortunately observed effect of heat transfer enhancement was not large in this study, but his is the first report on a negative thermal expansion object in the author's knowledge. The characteristics of motion and heat transfer of the device were addressed with measurements of pressures and temperatures in the vessel.
- 一般社団法人日本機械学会の論文
- 2000-10-01
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