A Study on Mechanisms of Convective Heat Transfer from a Rotating Drum with Fin Array under High Heat Flux Conditions.

高热通量条件下翅片阵列旋转滚筒对流换热机理研究。

• 批准号: 15560186
• 负责人: YOSHIDA Keisuke
• 金额: $ 1.98万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560186/
• 关键词: Rotating Body; Retarder; Finned Surface; Heat Transfer Enhancement; Convective Heat Transfer; Optimum Design; Rotating Drum; Finned Surface; Forced Convection; Retarder; Heat Transfer; Enhancement

When a rotating drum or cylinder is cooled down, a fin array structure on the outer surface is often adopted as an extended surface to improve the heat removal performance. In this case it is also expected that the heat transfer coefficient increases due to an agitation effect by the fins compared with that for the drums without fins. However, there is very little information on the heat transfer characteristics for this type of heat transfer system. This study aimed to obtain experimentally the convective heat transfer characteristics from the rotating drum with fin array to ambient air under high heat flux conditions, and to clarify the heat transfer mechanisms.Two major experiments were performed : (1)the heat transfer experiment to obtain the heat removal performance and average heat transfer coefficients of the rotating drum with fin array for high heat flux and high rotating speed conditions, and (2)the experiment using the irreversible temperature-sensitive paints, which were pa … More inted on the fin surface, in order to obtain the temperature profiles on the fin surface and the information on the local heat transfer coefficients. The drum tested in this study was made of steel and had an outer diameter of 326mm, on which the fin array was arranged with fins having a height of 15mm. The experiments were performed by using a heat transfer experiment setup for rotating body, with changing fin arrangement (fin pitch, fin angle, and fin thickness) under various rotating speeds (up to 2400prm). The results obtained in this study were as follows.(1)The heat transfer of the finned surface is enhanced compared with the drum without fins. The highest enhancement is obtained for the drum with the fin angle of 30° ; and is about 3.5 times as high as that of the cylinder without fins for the same rotating speed. While the heat transfer coefficient monotonically varies with rotating speed to the power of 0.70, its proportionality factor changes complexly with fin arrangement, i.e., fin pitch and fin angle.(2)The heat transfer of this system consists of the following three mechanisms (a)channel flow passing through the adjacent fins, (b)cavity flow over the tops of the fins, and (c)natural convection induced by the centrifugal force, which is not negligible under the high temperature surface condition at the high heat flux. The magnitude of contribution of these three mechanisms to the heat transfer causes the complex heat transfer characteristics of the rotating drum with fin array.Finally, non-dimensional heat transfer correlations were proposed from the above results. Less

当旋转的滚筒或圆柱体冷却时，外表面上的鳍阵列结构通常被用作扩展表面，以改善去除量的性能。在这种情况下，还可以预期，与没有鳍片的鼓相比，鳍片的搅动效果会增加，这会增加，而鳍片的搅动效果会增加。但是，关于此类传热系统的传热特性的信息很少。这项研究旨在通过实验获得从旋转的鼓阵旋转的旋转滚筒到高热通量条件下的环境空气的对流传热特性，并阐明传热机制。进行了主要实验。为了获得鳍片表面上的温度曲线以及局部传热系数的信息，涂料是PA…更详细的。这项研究中测试的鼓是用钢制成的，外径为326mm，在其上排列了鳍阵列，鳍的高度为15mm。通过使用传热实验设置进行旋转体进行实验，并在各种旋转速度（高达2400Prm）下使用变化的鳍片布置（FIN）螺距，鳍角和鳍片厚度）进行。在这项研究中获得的结果如下。（1）与没有鳍的滚筒相比，鳍表面的热传递得到了增强。对于30°的鳍角度，获得了最高的增强功能；并且大约是圆柱体的3.5倍，而没有鳍片的旋转速度。而传热系数单调变化。 with rotating speed to the power of 0.70, its proportionality factor changes complexly with fin arrangement, i.e., fin pitch and fin angle.(2)The heat transfer of this system consists of the following three mechanisms (a)channel flow passing through the adjacent fins, (b)cavity flow over the tops of the fins, and (c)natural conversion induced by the centrifugal force, which is not negligible under the high temperature surface condition at the high heat通量。从上述结果中提出了这三种机制对传热的三种机制对传热的贡献导致旋转鼓的复杂传热特性。较少的

项目成果

A Correlation of Forced Convective Heat Transfer for a Rotating Drum with Fin Array

翅片阵列旋转滚筒强制对流换热的相关性

• 发表时间: 2003
• 期刊: Proc.40th Natinal Heat Transfer Symposium 40-2

フィン付回転円板の対流熱伝達

翅片旋转盘中的对流传热

• 发表时间: 2005
• 期刊: 第42回日本伝熱シンポジウム講演論文集 (印刷中)
• 作者: 吉田敬介;田坂誠均 他2名
• 通讯作者: 田坂誠均 他2名

Convective Heat Transfer from a Rotating Disk with Fins

带翅片的旋转盘的对流传热

• 发表时间: 2005
• 期刊: Proc.42th Natinal Heat Transfer Symposium (in press)
• 作者: K.Yoshida;M.Tasaka;et al.
• 通讯作者: et al.

Forced Convective Heat Transfer from a Rotating Drum with Fin Array (Consideration on the Similarity with Flow in a Rectangular Channel)

翅片阵列旋转滚筒的强制对流换热（考虑与矩形通道内流动的相似性）

• 发表时间: 2003
• 期刊: Proc.Thermal Engineering Conference '03 3-30
• 作者: K.Yoshida;M.Tasaka;et al.
• 通讯作者: et al.

吉田敬介, 他: "フィン付回転ドラムの強制対流熱伝達整理式"第40回日本伝熱シンポジウム講演論文集. 40-2. 481-482 (2003)

Keisuke Yoshida 等人：“带有翅片的旋转滚筒的强制对流传热公式”第 40 届日本传热研讨会论文集 40-2（2003 年）。