首页> 外文期刊>International Journal of Heat and Mass Transfer >Characteristics of instantaneous heat transfer rates in three heat-transfer-coefficient regimes
【24h】

Characteristics of instantaneous heat transfer rates in three heat-transfer-coefficient regimes

机译:三种传热系数方式下的瞬时传热速率特征

获取原文
获取原文并翻译 | 示例
           

摘要

Instantaneous heat transfer coefficients (h) for flows of various fluids (mercury, air, water, and motor oil) over plates inclined at various angles have been fundamentally examined. We have discovered three distinctive regimes, in which fluids behave interestingly. In regime I, as h increases, instantaneous heat transfer rates (q) decrease, defying our physical intuition. Regime Ⅱ exhibits maxima in q-versus-h curves. In regime Ⅲ, h becomes a strong function of time especially for t e [0,1 s], revealing the possible deficiency of traditional lumped-capacitance models. Results of computational simulations are obtained using COMSOL commercial package whose algorithm is based on the Galerkin finite element method, and exhibit qualitatively-correct trends when compared with classical solutions for steady-state cases.
机译:从根本上研究了各种流体(汞,空气,水和机油)在以各种角度倾斜的板上流动的瞬时传热系数(h)。我们发现了三种独特的状态,其中流体的行为有趣。在方案I中,随着h的增加,瞬时传热速率(q)减小,这违背了我们的物理直觉。区域Ⅱ在q-h曲线上表现出最大值。在Ⅲ区,h成为时间的强函数,尤其是在t e [0,1 s]时,这表明传统集总电容模型可能存在缺陷。使用COMSOL商业软件包获得了计算仿真的结果,该软件包的算法基于Galerkin有限元方法,并且与稳态情况下的经典解决方案相比,具有定性正确的趋势。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号