Ventsislav D. Zimparov

TL;DR: In this article, a three-start spirally corrugated tubes combined with five twisted tape inserts with different relative pitches in the range of Reynolds number 3×103-6×104.

TL;DR: In this article, a single-start spirally corrugated tubes combined with five twisted-tape inserts with different relative pitches in the range of Reynolds number 4×10 3 −6×10 4.

TL;DR: In this paper, performance evaluation equations for enhanced heat transfer surfaces based on the entropy production theorem are reported, which originate from various design constraints and generalize the performance evaluation criteria (PEC) obtained by means of first law analysis.

TL;DR: Extended performance evaluation criteria equations for enhanced heat transfer surfaces based on the entropy production theorem are developed to include the effect of fluid temperature variation along the length of a tubular heat exchanger as discussed by the authors.

TL;DR: In this paper, an extended performance evaluation criteria for enhanced heat transfer surfaces based on the entropy production theorem has been developed to include the effect of fluid temperature variation along the length of a tubular heat exchanger with constant wall temperature as a boundary condition.