非水溶性凝固球の水中での融解熱伝達(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
This paper deals with experimental and analytical heat transfer study of nonadecane spheres melting in natural convection of water. Experimental local and average heat transfer coefficients were obtained by analyzing the photo images of the shape change of nonadecane spheres. The relevant dimensionless parameters were varied in the ranges of 1.8×10^7〓Gr_n・Pr_n〓1.8×10^8 and 0.04〓C_n⊿T/L_n〓0.16. We found: (1) Melting nonadecane sphere was covered with thin nonadecane liquid film flowing upwards along the sphere to make a liquid cap on the top. The cap regularly repeated formation and splitting off. (2) The experimental average Nusselt number was correlated by Nu=0.151 (Gr_n・Pr_n)^<0.257> (C_n⊿T/L_n)^<0.117> that was in good agreement with analytical one. (3) On the lower hemisphere experimental heat transfer coefficients were slightly higher than analytical ones and on the upper hemisphere the experimental heat transfer coefficients were slightly lower than analytical ones.
一般社団法人日本機械学会の論文
2006-03-25