Abstract
The present study focused on evaluating the heat transfer behavior and predicting the surface resulting status during air/water droplets two-phase flow. Transient heat transfer based on the lumped capacitance model (LCM) was investigated experimentally under a range of water droplets concentration, surface temperature, and varying Re number. Compared with a single-phase air cooling, the transient surface temperature decreased with the increase in water droplets concentration and Re number. At the same cooling time, the surface temperature decreases about 13.5%, 47%, and 53.2% for (j = 46.79 – 111.68 kg/m2 hr). It was also noticed that the heat transfer coefficient increased with the increase in water droplets concentration and reach its maximum value at (j = 111.68 kg/m2 hr). Based on the analysis of the experimental results, the heat transfer mechanism due to the impacting of water droplets on the sphere surface was classified into three important physical regimes. Clear convection heat transfer regime corresponds to the dry region (region I); Convection and evaporation regimes correspond to the dry-out and wet regions (region II and III).
Highlights
Air/water droplets cooling technique applied in numerous industrial and technical processes such as the heat exchanger modules in nuclear and thermal power plants, cooling of electronic and electrical equipment, etc., considered to be an excellent technique and distinguished by the higher heat transfer rate compared with those obtainable by conventional single-phase air cooling [1,2,3,4,5]
Based on the analysis of the experimental results, the heat transfer mechanism due to the impacting of water droplets on the sphere surface was classified into three important physical regimes
In order to evaluate the effect of air/water droplets cooling process on the test sphere and predicate the resulting status of the heating surface, there were done the experiments under a range of water droplet concentration (j = 46.79 – 111.68 kg/m2.hr) and Reynolds number (Re) number varying from (2.5·104 to 5.5·104)
Summary
Air/water droplets cooling technique applied in numerous industrial and technical processes such as the heat exchanger modules in nuclear and thermal power plants, cooling of electronic and electrical equipment, etc., considered to be an excellent technique and distinguished by the higher heat transfer rate compared with those obtainable by conventional single-phase air cooling [1,2,3,4,5]. Transient heat transfer based on the lumped capacitance model (LCM) was investigated experimentally under a range of water droplets concentration, surface temperature, and varying Re number.
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