Abstract
Analysis and Test on Influence Factors of Dew Drop Condensation in Dew Point Hygrometer
Highlights
The dewpoint meter is a high-precision gas humidity measurement instrument that is commonly used in meteorological operations as a gauge of air humidity
The growth rate of dew drops is different under different conditions of mirror temperature, ambient temperature and water vapor pressure
The main conclusions are listed as follows: (1) The growth rate of droplets is affected by ambient temperature, dew point temperature, mirror temperature, and air velocity
Summary
The dewpoint meter is a high-precision gas humidity measurement instrument that is commonly used in meteorological operations as a gauge of air humidity. The basic principle of the dew point meter is to make the water vapor in the measured gas close to saturation by pressure equalizing the temperature of the gas and condense on the condensing surface to obtain the dew point temperature of the gas to be measured [Sun and Wang (2009)]. Based on the measured dew point temperature and saturated vapor pressure calculation formula (WMO recommended Goff-Gratch formula) to calculate the relative humidity. The measurement error in relative humidity is one of the main factors affecting the measurement accuracy of chilled mirror dew point instrument [Su, Zhao and Gao (2011)]. The micro-physical process of dew drop condensation was first studied based on the growth of water vapor condensation and the Maxwell equations for water vapor diffusion, the relationship between temperature, vapor pressure, water vapor density, and water droplet radius were established. Dong et al measured the growth of dew drop by laser speckle [Dong (1999)], Julian E. et al through the establishment of special devices, research the effect of relative humidity on the dynamic process of dew drop condensation [Castillo, Weibel and Garimella (2015)]
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