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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

DETERMINATION OF WET-BULB TEMPERATURE AND RELATIVE HUMIDITY OF REDUCED AMBIENT PRESSURE ENVIRONMENT: COMPUTER SIMULATION AND RAINBOW THERMOMETRY VALIDATION

Get access (open in a dialog) pages 407-415
DOI: 10.1615/TFEC2018.cmd.021664

要約

In normal atmospheric environment, wet-bulb temperature can be read from a wet-bulb thermometer inserted in a stimulating convection environment where heat is being transferred from the thermometer to the surrounding moist air. With the known dry-bulb and wet-bulb temperatures, one can calculate the relative humidity of the environment from the classical mass and energy balances or by using a psychrometric chart. However, for a confined and reduced ambient pressure environment, it is difficult to build the convection situation, to insert the wet-bulb thermometer and to read wet-bulb temperature with the intrusion probe. The psychrometric charts for the reduced ambient pressure environments are also rare. In this paper, we simulate the time evolution of the size of a suspended evaporating droplet using modified D2-law model and fit the modeling results to the measured droplet's diameter from their image time series in order to determine the wet-bulb temperature and the relative humidity of the reduced ambient pressure environment. The rainbow thermometry measurement technique has been employed to measure the image series of diameter of the evaporating droplet. The wet-bulb temperature is verified by psychrometric calculations using the known dry-bulb temperature, the total pressured and the (simulated) relative humidity.