Application of planar laser-induced fluorescence measurement techniques to study the heat transfer characteristics of parallel-plate heat exchangers in thermoacoustic devices
Application of planar laser-induced fluorescence measurement techniques to study the heat transfer characteristics of parallel-plate heat exchangers in thermoacoustic devices
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DOI：
10.1088/0957-0233/21/11/115405
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发表时间：
2010-11
影响因子：
2.4
通讯作者：
Lei Shi;Xiaoan Mao;A. Jaworski
中科院分区：
文献类型：
--
作者：
Lei Shi;Xiaoan Mao;A. Jaworski
本文介绍了一种实验装置的开发和丙酮基平面激光诱导荧光（PLIF）测量技术的应用，以研究热声装置的平行板换热器的传热过程的非稳态特性。实验装置是一个四分之一波长的声谐振器，驻波施加振荡流条件。两个模拟热交换器，“热”和“冷”，有他们的鳍保持在恒定的温度，分别通过电加热和水冷却。一个专门设计的丙酮示踪播种机构用于PLIF温度测量。从PLIF信号强度的角度优化丙酮浓度。二维温度分布在周围的热交换器板的气体中，作为在声学循环中的相位角的函数，得到。局部和全球（瞬时和周期平均）的翅片表面上的热通量值进行估计，并用于获得的空间周期平均努塞尔与雷诺数的依赖性。测量不确定度进行了讨论。
This paper describes the development of an experimental arrangement and the application of acetone-based planar laser-induced fluorescence (PLIF) measurement techniques to study the unsteady characteristics of heat transfer processes in the parallel-plate heat exchangers of thermoacoustic devices. The experimental rig is a quarter-wavelength acoustic resonator where a standing wave imposes oscillatory flow conditions. Two mock-up heat exchangers, ‘hot’ and ‘cold’, have their fins kept at constant temperatures by electrical heating and water cooling, respectively. A purpose-designed acetone tracer seeding mechanism is used for PLIF temperature measurement. Acetone concentration is optimized from the viewpoint of PLIF signal intensity. Two-dimensional temperature distributions in the gas surrounding the heat exchanger plates, as a function of phase angle in the acoustic cycle, are obtained. Local and global (instantaneous and cycle-averaged) heat flux values on the fin surface are estimated and used to obtain the dependence of the space-cycle averaged Nusselt versus Reynolds number. Measurement uncertainties are discussed.