MEASUREMENT OF LOCAL CONVECTIVE HEAT-TRANSFER COEFFICIENTS USING 3-DIMENSIONAL INTERFEROMETRY
MEASUREMENT OF LOCAL CONVECTIVE HEAT-TRANSFER COEFFICIENTS USING 3-DIMENSIONAL INTERFEROMETRY
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DOI：
10.1016/0017-9310(91)90006-z
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发表时间：
1991-04-01
影响因子：
5.2
通讯作者：
LIBURDY, JA
中科院分区：
文献类型：
--
作者：
BAHL, S;LIBURDY, JA
本文利用空气中水平加热圆盘上方三维温度场的重建来确定局部换热系数。 全息干涉测量法用于获得关于局部折射率分布的瞬时三维信息。 在有限的视场和有限的条纹阶数的约束下，几种重建程序进行了测试。 这些技术用于精确测量瞬时局部温度分布。 随后，通过曲线拟合程序指定表面温度梯度，并确定局部传热系数。 表面平均Nusselt数与文献中的先前研究非常吻合。 真实的时间全息干涉术也被用来建议对流传热过程的一些动态特性。 结果表明，局部不稳定性的形式，分布爆发的热能从表面。 此外，在足够高的表面温度下，整个温度场显示出振荡或脉动的证据，这表明全球热释放机制。
The reconstruction of the three-dimensional temperature distribution above a horizontal heated disk in air is used to determine the local heat transfer coefficients. Holographic interferometry is used to obtain instantaneous, three-dimensional information on the local index of refraction distribution. Several reconstruction procedures are tested under the constraints of limited field of view and limited fringe order data. These techniques are used to accurately measure the instantaneous local temperature distribution. Subsequently, the surface temperature gradients are specified by curve fitting procedures and the local heat transfer coefficients determined. The surface averaged Nusselt number agrees very well with previous studies in the literature. Real time holographic interferometry is also used to suggest some of the dynamic characteristics of the convective heat transfer process. Results show local instabilities in the form of distributed bursting of thermal energy from the surface. Also, at sufficiently high surface temperatures the entire temperature field shows evidence of oscillation or pulsation which indicates a global heat release mechanism.