权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

電場による液体内温度境界層近傍のみの乱流化効果に対する最適化と熱伝達制御の研究

电场作用下液体温度边界层附近湍流效应优化及传热控制研究

基本信息

批准号：
01550164
负责人：
成合英樹
金额：
$ 1.28万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至无数据
项目状态：
已结题

项目摘要

熱交換器において、圧力損失の増加を最小限に抑え熱伝達を大巾に増大させる方法として、電場により境界層近傍のみの能動的な乱流化効果をはかる方法を考案し実験を行った。すなわち壁面近傍に流れと平行に細線電極を設置し、これと壁面間に高電圧を印加し、流量、印加電圧を変化させた場合の熱伝達率を測定すると共に、平均速度、変動速度、圧力損失などを測定し、流動特性に基づいて伝熱特性を考察した。作動流体としてはフロンR113とエタノ-ルの混合液体を用い、高さ20mm、巾150mm、長さ1.6mの透明塩化ビニル製矩形流路の上下面にステンレス箔を接着し交流通電加熱を行った。上下壁面から距離5mm流路巾方向に20mm間隔で流れと平行方向に計14本のステンレス線を設置し伝熱面との間に高電圧(0〜10KV)を印加した。流量は層流から乱流までのRe=1470〜27300の範囲で、熱電対による温度計測と共に、圧力差の計測、He-Neレ-ザ-による時間平均速度、変動速度の計測も行った。平均熱伝達率は、電場の印加電圧が0の場合Reの増加に対して単調に増大する。印加電圧を増大すると熱伝達率は増加するが、増加割合はReの小さな層流域の方が大きい。本実験範囲では印加電圧0の時に対する熱伝達率の増加率は、Re=1470、印加電圧5KVの時の約20倍が最大であった。次に、流れ方向速度の時間平均値と速度変動強度を調べた。電圧印加により変動強度は増大し、それに伴い平均速度分布は平坦化している。従って、伝熱促進機構は、誘起される2次流れとその速度変動による拡散作用の増大のためとみなすことができた。圧力損失は、印加電圧が高く、Re数が大きい程増大した。しかし、熱伝達率の増加割合は抵抗係数のそれより大きく、電場付与が有効であることを確認した。これらのデ-タをもとに最適化の検討を行うと共に乱流発生モデルの検討をさらに今後行う。

The application of the equipment, the power loss and the minimum limit can reach the level of the large towel, the method of the large towel, the method of the computer field, the method of random flow, the method of random flow, and the method of examination. The temperature field near the wall, the parallel cable, the pole setting, the high power supply, the flow rate, the average speed, the moving speed, the force loss temperature and the flow characteristics are measured in this paper. The operating fluid is sensitive to R113 temperature, which is used for mixing liquids, high 20mm, towel 150mm, 1.6m long and transparent, and the rectangular flow path is located on the top and bottom of the rectangular flow path, followed by an AC connection. The upper and lower wall surfaces are far away from the 5mm flow towel direction and the 20mm separation flow direction is in the parallel direction. In this book, the equipment equipment is set up, and the equipment is located in the high power station (0~10KV). The flow rate, the turbulence, the Re=1470~27300 range, the thermal temperature meter, the force difference meter, the average speed of the He-Ne engine-to-air cycle, and the moving speed range are compared. The average sales rate is low, and the price of Re is equal to that of Incas and Incas. Inca Electric Power Station (Inca) is responsible for the increase in the cost of Re, the increase in the cost of electricity, and the increase in the cost of the whole basin. This range is about 20 times the maximum cycle time of Re=1470, Re=1470, and Inca 5KV. Secondary, flow direction, speed, time, average speed, speed, intensity, intensity, speed, strength, strength, speed, speed, strength, strength, speed, strength, speed, strength, strength, speed, speed, strength, strength, speed, strength, strength, speed, speed, strength, strength, speed, strength, strength, speed, speed, strength, strength, speed, strength, strength, speed, speed, strength, strength, speed, speed, strength, strength, The power of the Inca train is high, and the average velocity distribution of the engine is flattened. There are two training stations in the market, the speed train is in the speed train, the speed train is dispersed, and the speed train is in the process of increasing the speed distribution. The loss of power, the high speed of Inca electric power station, and the high speed of Re. The number of resistance, the number of resistance, the amount of money, the rate of payment, the rate of resistance, the number of resistance, the number of resistance, the rate of payment, the rate of resistance, the number of resistance, payment and confirmation. I don't know what to do. I don't know what to do.