Development of a novel method to measure unsteady heat transfer caused by flow turbulence using infrared thermography

开发一种利用红外热成像测量湍流引起的不稳定传热的新方法

• 批准号: 22560214
• 负责人: NAKAMURA Hajime
• 金额: $ 2.66万
• 依托单位: 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560214/
• 关键词: 対流; 乱流; 非定常熱伝達; 計測; 赤外線カメラ; 対流熱伝達; はく離・再付着; 時空間分布測定; はく離・再付着流れ

Convective heat transfer via turbulent flow fluctuates complicatedly in time and space, the phenomenon of which is generally seen inside and outside heat transfer equipments. To improve thermal performance and reliability of the equipments, it is necessary to evaluate the fluctuating heat transfer quantitatively. In this work, a novel method was developed to measure the complicated fluctuating heat transfer between a solid-wall and a fluid-flow caused by flow turbulence by using high-speed infrared thermography. A test model was devised to measure the heat transfer coefficient which excludes the effect of thermal inertia and thermal diffusion of a solid-wall. In addition, data analysis technique was developed to evaluate instantaneous distribution of the heat transfer coefficient and its temporal fluctuation. As a result, it was demonstrated that the quantitative evaluation was possible for turbulent flows on a flat plate and in a circular pipe.

湍流对流换热在时间和空间上具有复杂的起伏，这种现象在换热设备内部和外部普遍存在。为了提高设备的热性能和可靠性，有必要对设备的脉动换热进行定量评价。本文提出了一种利用高速红外热像仪测量流体湍流引起的固体壁面与流体之间复杂脉动换热的新方法。设计了一个实验模型来测量固体壁热传递系数，该模型不考虑固体壁面的热惯性和热扩散的影响。此外，还开发了数据分析技术来评估换热系数的瞬时分布及其时间波动。结果表明，对平板和圆管内的湍流流动进行定量评价是可能的。

项目成果

Spatio-Temporal Characteristics of Heat Transfer in Separated and Reattaching Flows

分离流和再附着流传热时空特性

• 发表时间: 2011
• 作者: H.Nakamura;S.Takaki;S.Yamada
• 通讯作者: S.Yamada

Unsteady Measurement of Convective Heat Transfer to a Water Flow in a Circular Pipe Using High-Speed Infrared Thermograph

使用高速红外热像仪对圆管中水流的对流传热进行非稳态测量

• 发表时间: 2013
• 作者: N. Shiibara;H. Nakamura;S. Yamada
• 通讯作者: S. Yamada

Visualization of Turbulent Heat Transfer to a Water Flow in a Circular Pipe Using High-Speed Infrared Thermography

使用高速红外热成像技术可视化圆形管道中水流的湍流传热

• 发表时间: 2013
• 作者: N. Shiibara;H. Nakamura;S. Yamada
• 通讯作者: S. Yamada

Visualization of Spatio-Temporal Heat Transfer to a Turbulent Flow

湍流时空传热的可视化

• 发表时间: 2012
• 作者: H. Nakamura;S. Takaki;S. Yamada
• 通讯作者: S. Yamada

赤外線カメラを利用した対流熱伝達の非定常測定

使用红外热像仪对对流传热进行非稳态测量