Abstract
This paper aims to evaluate the effects of water mist on steady natural convection heat transfer from a sphere. Experimental investigations were performed for the Nusselt number (Nu) under a range of water mist concentration in both cases, sphere located in an open volume space with constant surrounding temperature and inside a cylindrical channel with sphere-to-channel diameter ratio (d/D=0.73). The results obtained from the related experimental work indicated that the heat transfer rate was enhanced over that for the single-phase air flow as a result of water mist evaporation on the heated surfaces. Compared to air cooling over a range of heat flux investigated, the percentage enhancement in the overall thermal factor was about 40%, 95.4%, 129.4%, and 156.8% respectively for all water mist concentration. In addition, an empirical correlation was also formulated to estimate the real benefits of using the water mist of the enhanced sphere.
Highlights
Natural convection heat transfer is an interesting subject that attracted the attention of different researchers in the academic research field but in several engineering applications, such as the passive cooling system in nuclear power plants, chemical and electronic cooling devises [1]
This paper aims to evaluate the effects of water mist on steady natural convection heat transfer from a sphere
Natural heat transfer enhancement based on the evaporation process of water mist is presented
Summary
Natural convection heat transfer is an interesting subject that attracted the attention of different researchers in the academic research field but in several engineering applications, such as the passive cooling system in nuclear power plants, chemical and electronic cooling devises [1]. Based on the heat transfer mechanism, the heat dissipation rate by natural convection is limited at the low-temperature difference and in some cases is not adequate for the operation conditions requirement. Due to the increase in energy demand and cost-saving, the heat transfer enhancement is required more efficient and compact heat dissipation devises with acceptable thermal consuming efficiency. Natural heat transfer enhancement based on the evaporation process of water mist is presented. The effect of deploying water mist on steady-state natural convection flow around a sphere with constant heat flux is experimentally examined and numerically validated
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