Basic Study on the Heat Transfer Augmentation in a Recirculating Flow Region

循环流区强化传热的基础研究

• 批准号: 63460099
• 负责人: SUZUKI Kenjiro
• 金额: $ 4.67万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460099/
• 关键词: Heat Transfer Augmentation; Recirculating Flow; Backward-Facing Step; Insertion of Cylinder; Heat Transfer Experiments; Flow Visualization; Laser Doppler Velocimetry; Numerical Computation; 後向きステップ流れ; 循環領域の非定常化; 非定常数値計算; 円柱によるかく乱; 非定常数値解析

Experimental and numerical studies were performed to see if it possible to enhance the heat transfer in the downstream region of a backward-facing step, where heat transfer is normally deteriorated, by the insertion of cylindrical body near the top corner of the step.From the results of the heat transfer experiment flow visualization and measurement of the averaged and fluctuating flow fields by LDV for the case when a cylinder was inserted, the following conclusions were obtained ;1) When the cylinder was mounted at a proper position, a jet-like flow pattern emerged in the averaged velocity profile beneath the cylinder, and the recirculating flow was intensified.2) The velocity fluctuation was intensified in the near wall region resulting in the effective augmentation of heat transfer.3) These intensifications result the enhancement of deteriorated heat transfer in the recirculating flow region.From the results of the numerical computation made for the backward-facing step flow obstructed by a square rod, it was concluded that the recirculating flow region can be destabilized when a square rod is properly mounted near the step, and that it causes the augmentation of heat transfer.

Experimental and numerical studies were performed to see if it possible to enhance the heat transfer in the downstream region of a backward-facing step, where heat transfer is normally deteriorated, by the insertion of cylindrical body near the top corner of the step.From the results of the heat transfer experiment flow visualization and measurement of the averaged and fluctuating flow fields by LDV for the case when a cylinder was inserted, the following得出结论； 1）当气缸安装在适当的位置时，在气缸下方的平均速度轮廓中出现了类似喷气的流动模式，并加剧了循环流动的速度波动。区域。从针对被方杆阻塞的向后置步流量的数值计算结果，可以得出结论，当在台阶附近正确安装方杆时，循环流动区域可能会不稳定，并且会导致热传递的增强。

项目成果

鈴木洋: 第2回数値流体力学シンポジウム講演論文集. 633-636 (1988)

铃木浩：第二届计算流体动力学研讨会论文集 633-636（1988）。

鈴木 洋,喜多 茂雄,中前 隆行,鈴木 健二郎: "後向きステップ流の熱伝達不良域の伝熱促進(第1報:上端角近傍に円柱を挿入した場合)" 日本機械学会論文集B編. 57巻536号. (1991)

Hiroshi Suzuki、Shigeo Kita、Takayuki Nakamae、Kenjiro Suzuki：“后向流动传热不良区域的传热增强（第 1 份报告：当圆柱体插入顶部拐角附近时）” 日本机械工程师学会汇刊， B 卷。第 57 卷，第 536 期。(1991)

Sigeo KIDA, Takayuki NAKAMAE, Hiroshi SUZUKI and Kenjiro SUZUKI: ""Flow and Heat Transfer Characteristics of a Disturbed Flow behind the Backward-Facing Step with a Cylinder" (in Japanese)" Proc. 27th National Heat Transfer Symp.vol. 1. 10-12 (1990)

Sigeo KIDA、Takayuki NAKAMAE、Hiroshi SUZUKI 和 Kenjiro SUZUKI：“带有圆柱体的后向台阶后面的扰动流的流动和传热特性”（日语）”Proc。

鈴木 洋,喜多 茂雄 中前 隆行,鈴木 健二郎: "後向きステップ流の熱伝達不良域の伝熱促進 (第一報:上端角近傍に円柱を挿入した場合)" 日本機機械学会論文集 B編. 57巻536号. (1991)

Hiroshi Suzuki、Shigeo Kita、Takayuki Nakamae、Kenjiro Suzuki：“后向阶梯流传热不良区域的传热增强（第一份报告：在顶角附近插入圆柱体的情况）”日本机械工程师学会汇刊， B 卷。第 57 卷，第 536 期。(1991)

鈴木洋: "角柱を挿入した平行平板間流れの流動、伝熱特性(第2報:非定常流の特性)" 第27回日本伝熱シンポジウム講演論文集. (1990)

铃木浩：“插入棱镜的平行板间流动的流动和传热特性（第 2 部分：非定常流动的特性）”第 27 届日本传热研讨会论文集（1990 年）。