In this work infrared thermography was applied to determine the thermal entry length of laminar-wavy tailing films. A dependence of the entry length on the Reynolds-number, the Prandtl-number and the ratio K = Pr_0/PrW between the Prandtl-numbers at inflow and wall temperature was found. Since in many applications the heat flux density is known rather than the temperatures of the heated surface and the inflow a correlation between K and the heat flux density against the Reynolds-number and the Prandtl-number at inflow temperature was found.
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机译：在该工作中，应用红外热成像来确定层状波状拖尾膜的热进入长度。发现了进入长度对雷诺数的依赖性，Prandtl-number k = pr_0 / prw在流入和壁温之间的比值。由于在许多应用中，发现热通量的密度是已知的，而不是加热表面的温度，并且发现了k和返回流入温度下的河豚数的k和热通量密度之间的相关性。
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