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Numerical simulation of temperature field on container of pVTt gas flow standard device tank |
1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Calibration and Testing Center for Gas Flowmeter of the Quality and Technology Supervision Bureau of Jiangsu, Zhenjiang, Jiangsu 212000, China |
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Abstract To solve the problem of gradually prolonged gas stabilization time in container during the operation of pVTt gas flow standard device, the mechanism and approach of rapid stabilization for the temperature field in standard device tank were investigated. The two-way fluid-solid-thermal coupling mathematical model and the temperature field simulation models under natural constant temperature mode and water-jacket constant temperature mode were established. The COMSOL multiphysics software was used to simulate and test the intake and constant temperature processes. The results show that the water-jacket constant temperature mode can effectively eliminate the severe temperature gradient phenomenon in the natural constant temperature mode and shorten the gas stabilization time in the standard device tank. The main affecting factor on rapid gas stabilization in standard device tank is the temperature difference between the inlet air temperature of tank and the water temperature in water jacket. Keeping the water temperature in water jacket substantially the same as the inlet air temperature of standard device can effectively shorten the gas stabilization time in standard device tank and improve the efficiency of gas flow meter verification.
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Received: 06 July 2018
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