CONVECTIVE HEAT-TRANSFER AND PRESSURE LOSS IN RECTANGULAR DUCTS WITH DROP-SHAPED PIN FINS

It has been experimentally researched that convective heat transfer an d pressure loss characteristics in rectangular channels with staggered arrays of drop-shaped pin fins in crossflow of air. The effects of ar rangements of pin fins on heat transfer and resistance are discussed a nd the row-by-row variations of the mean Nusselt numbers are presented . By means of the heat/mass transfer analogy and the naphthalene subli mation technique, the heat transfer coefficients on pin fins and on en dwall (base plate) of the channel have been achieved respectively. The total mean heat transfer coefficients of pin fin channels are calcula ted and the resistance coefficients are also investigated. The experim ental results show that heat transfer of a channel with drop-shaped pi n fins is higher than that with circular pin fins while the resistance of the former is much lower than that of the latter in the Reynolds n umber range from 900 to 9000.