An Experimental Investigation into Expedient Enhancement of Convective Heat Transfer in the Rectangular Ducts of Tubular-Plate Heat-Transfer Surfaces Having Transverse Projections and Grooves

摘要

Results are presented from systematic experimental investigations into enhancement of convective heat transfer in air in short rectangular channels having transverse projections and grooves [with the Re numbers varying in the range (0.6-10) × 10~3; the relative length of the channel's smooth section, from 0.183 to 2.003; and the channel cross-section contraction ratio, from 0.748 to 0.953]. Conditions are determined under which convective heat transfer can be efficiently enhanced through artificially turbulizing the flow of coolant by means of periodical throttling, and the degree of this enhancement is evaluated.