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LIQUID THERMAL CONDUCTIVITY MEASURING METHOD USING NATURAL CONVECTION HEAT TRANSFER
LIQUID THERMAL CONDUCTIVITY MEASURING METHOD USING NATURAL CONVECTION HEAT TRANSFER
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机译：自然对流换热的液体导热系数测量方法
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摘要
PURPOSE: To calculate a heat transfer coefficient of liquid by measuring a heat transfer amount of the liquid by utilizing steady state convection heat transfer in the liquid along a heat generator. ;CONSTITUTION: A similarity rule exists for a convective heat transfer in liquid along a heat generator. That is, when geometric conditions of a heating surface are decided, convective heat transfer characteristics can be represented in terms of the relationship between a dimensionless heat transfer coefficient (Nusselt number Nu) and a dimensionless number (Rayleigh number Ra) indicating the strength of the convection irrespective of the hydrodynamic properties and the thermal physical properties of the liquid. When the heated surface has a simple shape, a convective heat transfer measuring system is introduced by the formula indicating the relationship Nu=a+bRac (a, b, c are constants determined according to the system). Liquid having unknown heat transfer coefficient is filled in this measuring system, the temperature of the heating surface is raised, and a transfer heat quantity (consumed power) in a steady state is measured. This operation is executed a plurality of times by altering the raised temperature, the consumed power and the raised temperature on the heating surface in the steady state at this time are measured and the unknown heat transfer coefficient can be derived by calculation.;COPYRIGHT: (C)1995,JPO
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机译：目的：通过利用沿热发生器的液体中的稳态对流传热来测量液体的传热量，从而计算液体的传热系数。 ;构成：液体中沿热发生器的对流传热存在相似规则。即，当确定加热表面的几何条件时，对流传热特性可以根据无因次传热系数（努塞尔数Nu）与无因次传热系数（瑞利数Ra）之间的关系来表示。对流，与液体的流体动力学特性和热物理特性无关。当受热面具有简单形状时，通过表示关系Nu = a + bRa c 的公式引入对流传热测量系统（a，b，c是根据系统确定的常数） 。在该测定系统中填充传热系数未知的液体，使加热面的温度上升，测定稳态下的传热量（消耗功率）。通过改变升高的温度多次执行该操作，测量此时处于稳态的加热表面上的功率消耗和升高的温度，并可以通过计算得出未知的传热系数。 1995年，日本特许厅
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