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Reserach

Development of high-efficiency energy transport technique using an oscillation-type heat transport pipe

Electronic equipment increases the heat density by the miniaturization and high performance. Therefore, heat transportation devices that are small and high-performance are required for the effective cooling of electronic devices and equipment.
Kurzweg and Zhao (1984) proposed the heat transportation devices which can realize great heat transportation by generating an "oscillatory flow" for reciprocating a fluid filled in a circular pipe, called dream pipe[1].
We are developing an oscillation-type heat transport tube as further application of this dream pipe. Specifically, oscillatory flow in the grooved tube which mimics the giraffe of the respiratory tract, or oscillatory flow in the curved tube that mimics elephant nose etc. Sometimes focusing on the biological structure, we are developing new transportation devices based on numerical and experimental analyses.
[1] Kurzweg, U. H. and Zhao, L.,Heat transfer by high-frequency oscillations, phys. Fluid,27-11(1984), 2624-2627.



DEVELOPMENT OF LATENT HEAT ENERGY STORAGE AND TRANSIT TECHNOLOGY

We develop a cold energy storage and transportation system using nighttime electric power.The system cools paraffin droplet group with a direct contact heat exchanger in order to stores cold heat.

It enables to transit cold energy more efficiently by mixing the coagulated paraffin droplet group in cold water.



VISUALIZATION OF TRANSITIONAL FLOW IN NASAL CAVITIES


Nose has functions such as gas transportation in respiration, olfaction, heat transfer and humidification, filtration. These functions closely relate to complicated structure of nasal cavity, but the behavior of the nasal flow is not well understood due to the complexity. Therefore, we analyze nasal flow by both of computer calculation and visualization experiment using nasal model constructed by CT images. We are trying to mimic the biological heat transport system and develop new energy devices.



VISUALIZATION OF BRAIN ANEURYSM FLOW

In order to help predicting cerebral aneurysm rupture, we visalize the inside flow and measure wall share stress, experimenting with model by the means of PIV mesurement. We create not only steady flow and sine wave but also pulsatile waveforms.