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作 者:李思文[1] 李华[1] 杨臧健[1] 任建莉[1] 钟英杰[1]
机构地区:[1]浙江工业大学能源与动力工程研究所,浙江杭州310032
出 处:《浙江工业大学学报》2013年第4期395-399,共5页Journal of Zhejiang University of Technology
摘 要:通过湍流条件下光管内流体脉动传热的实验研究,分析了流体脉动参数对强化换热的影响规律。用无量纲参数A。和Womersley数描述脉动振幅和脉动频率,并利用最小二乘法拟舍得到了实验范围内脉动振幅与Nu数之间的关系。结果表明:在实验范围内(16≤υ≤40m/s,0≤f≤100Hz),雷诺数、脉动振幅和脉动频率对流体脉动强化换热都有显著的影响,随着雷诺数和脉动振幅的增加,换热效果将增强;而当脉动频率在O~20Hz以下和80~100Hz两个频率区间内脉动传热存在最优值;在实验条件下,利用A。和w数可以较好的表征脉动振幅和脉动频率特性。Pulsating flow in a pipe under turbulent conditions has been experimentally investigated to determine the effect of pulsation on the rate of heat transfer. The influence of pulsa;dng parameters to the heat transfer enhancement has been carefully studied. Two dimensionless parameters, A0 and Womersley number, are used to describe the pulsation amplitude and pulsation frequency, respectively. And the fitting result between pulsation amplitude and Nusselt number is obtained by using least squares method. The results show that pulsation frequency and pulsation amplitude have a significant impact on the pulsating heat transfer enhancement as well as Reynolds number. The heat transfer enhancement is found to increase as Reynolds number increases, while the best pulsation frequency exists respectively in the range of 0 to 20 Hz and 80 to 100 Hz. Characteristics of pulsation amplitude and pulsation frequency can be reflected by A0 and Womersley from the fitting results number under the experimental conditions.
分 类 号:TK124[动力工程及工程热物理—工程热物理]
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