• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer of impinging jet array with web-patterned grooves on nozzle plate
【24h】

Heat transfer of impinging jet array with web-patterned grooves on nozzle plate

机译：喷嘴板上带有网状凹槽的冲击射流阵列的传热

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Heat transfer performances of the impinging jet arrays issued from the nozzle plates without and with the two types of the interconnected grooves were experimentally studied at jet Reynolds numbers (Re-j) and nozzle-to-plate distances (S) in the respective ranges of 1500-20,000 and 0.1-8 times of the nozzle diameters (d(j)). Owing to the significant spent flow confinement formulated between the smooth nozzle plate and the impinging surface at S/d(j) 0.3, the mechanism of heat transfer enhancement (HTE) relevant to the impinging jet array was considerably suppressed. The relaxation of spent flow confinement by imprinting the web-patterned grooves on the nozzle plate at the small S/d(j) effectively resumed the HTE characteristic in association with the impinging jet array. At large S/d(j), the additive ambient fluid entrainment from the grooves enriched the jet momentum to boost the heat transfer level from that produced by the smooth nozzle plate. Both the Nusselt number level and the heat transfer uniformity for the smooth and grooved nozzle plates were comparatively studied with the Re-j and S/d(j )effects examined. In conformity with the experimental observations for the isolated and coupled Re-j and S/d(j) effects, the regression-type analysis was performed to generate a set of empirical correlations that permitted the evaluation of the average Nusselt number (Nu) over the central jet region for each of the present impinging jet arrays. (C) 2019 Elsevier Ltd. All rights reserved.
机译：通过喷嘴雷诺数（Re-j）和喷嘴到板的距离（S）在各自的范围内进行实验研究了不使用和使用两种类型的互连凹槽的喷嘴板发出的撞击喷嘴阵列的传热性能。喷嘴直径（d（j））的1500-20,000和0.1-8倍。由于在S / d（j）<0.3时在光滑的喷嘴板和撞击表面之间形成了明显的废流限制，因此与撞击射流阵列相关的传热增强（HTE）机理得到了显着抑制。通过在喷嘴板上以小S / d（j）压印腹板图案的凹槽来缓解废流限制，可以有效恢复与撞击射流阵列相关的HTE特性。在较大的S / d（j）时，凹槽中夹带的附加环境流体会丰富射流动量，从而提高由光滑喷嘴板产生的传热水平。通过检查Re-j和S / d（j）效果，比较研究了光滑和带凹槽喷嘴板的Nusselt数水平和传热均匀性。与隔离和耦合的Re-j和S / d（j）效应的实验观察结果一致，进行了回归类型分析，以生成一组经验相关性，从而可以评估平均Nusselt数（Nu）每个当前撞击射流阵列的中央射流区域。 （C）2019 Elsevier Ltd.保留所有权利。

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