Fluid Flow and Heat Transfer Characteristics for a Corrugated Duct

波纹管的流体流动和传热特性

基本信息

批准号：
63550170
负责人：
ASAKO Yutaka
金额：
$ 1.28万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Measurements for the pressure drop and the flow visualization were done for low Reynolds number fluid flow in corrugated ducts with sharp edge corners. The Reynolds number of the fluid flow ranges from 40 to 2000. The pearl graze was used for the flow visualization as a tracer. The critical Reynolds numbers and correlations for the friction factor and the Reynolds number for the fluid flow in the ducts were obtained from these results. These results were presented at the 26th Heat Transfer Symposium in Japan. The experiments were done for two ducts with the corrugation angle of 30 and 45 degrees. The total numbers of corrugation cycle were 19.5 and 25.5 for 30 and 45 degree ducts, respectively. The elevation of the corrugation is 10 mm for both ducts. The channel height of the ducts were 5, 10 and 15 mm. The following results were obtained: (1) The critical Reynolds numbers range from 100 to 210 and 60 to 220 for the ducts of 30 and 45 degree corrugation angles, respectively. (2) The friction factor for low Reynolds number fluid flow coincides with the value which is obtained by numerical computation with the assumption of laminar flow.The experiments for the mass transfer were done for low Reynolds number fluid flow. The Reynolds number ranges from 200 to 550. The naphthalene sublimation technique was used for measurement of the mass transfer coefficient. The corrugation angle is 30 degree, the length of one cycle is 20 mm, and the channel height of the duct is 10 mm. The total number of corrugation cycle is 13.5. the width of the duct is 110 nm. As the consequence, the aspect ratio of the cross section of the duct is 11. The following results were obtained: (1) The mean mass transfer coefficient in the periodically fully developed region coincides with the value which is obtained by the numerical computation with the assumption of laminar flow. (2) The effect of the turbulence of the low Reynolds number fluid flow to heat transfer is relatively small.

对于较低的雷诺数流体流量，在具有锋利的边缘弯曲的波纹管中进行了压降和流动可视化的测量。流体流量的雷诺数范围为40到2000年。珍珠放牧用于流动可视化作为示踪剂。从这些结果中获得了摩擦因子的临界雷诺数和摩擦因子的相关性和雷诺数的相关性。这些结果在日本的第26次传热研讨会上呈现。对两个管道的波纹角度为30和45度进行了实验。对于30和45度导管，波纹周期的总数分别为19.5和25.5。两种管道的波纹升高为10 mm。管道的通道高度为5、10和15毫米。获得以下结果：（1）临界雷诺数分别为30和45度波纹角度的管道范围为100至210至210至220。（2）低雷诺数流体流量的摩擦因子与数值计算与层流的假设获得的值一致。对于低雷诺数流体流量，进行了传质的实验。雷诺数范围为200至550。萘升华技术用于测量传质系数。波纹角度为30度，一个周期的长度为20 mm，管道的通道高度为10 mm。波纹周期的总数为13.5。管道的宽度为110 nm。结果，导管的横截面的纵横比为11。获得了以下结果：（1）周期性完全开发的区域中的平均传质系数与数值计算与层流流的假设获得的值相吻合。（2）低雷诺数流体流向传热的湍流的影响相对较小。