Enhanced Condensation of R-113 and Steam Using Three-Dimensional Pin-Fin Tubes

Hydrodynamics in bubble columns with pin-fin tube internals

“…Li et al (2003) experimentally studied heat transfer characteristic of a tube with elliptic pin fins in crossflow of air and found that tube with elliptic pin fins had 30% higher heat transfer coefficient than that of a smooth circular tube. Briggs (2003) investigated condensation of R-113 and steam on pin-fin tubes, and the results showed that pin fins enhanced vapour-side heat transfer coefficient between 3.6 and 9.9 times for R-113 and between 2.4 and 2.9 times for steam in comparison with a plain tube at the same vapour-side temperature difference. Shi et al (2012) reported heat transfer and pressure drop characteristics of integral pin-fin tubes with M a n u s c r i p t lubricating oil as heat transfer media, and the heat transfer enhancement of integral pin-fin tubes was 2~6 times comparing with the plain tube under the same condition and the fin length was the main factor influencing pressure drop.…”

Free convection condensation of steam on horizontal wire wrapped tubes: Effect of wire thermal conductivity, pitch and diameter

“…The effect of thermal conductivity was less important for R-113, however, more important for the case of ethylene glycol. The best reported enhancement ratio for the case of steam, R-113 and ethylene glycol on pin-fin tubes are 4.1, 9.9 and 5.5 respectively (see Briggs [19], Baiser and Briggs [20] Ali and Briggs [14,15]). Based on the reported experimental data on pin-fin tubes, recently, Ali and Briggs [21] reported a semi-empirical model for condensation heat transfer on pin-fin tubes.…”

A semi-empirical model for free-convection condensation on horizontal pin–fin tubes

“…For the minimization process, the experimental data used are taken from the investigations of (Briggs [21], Baiser and Briggs [22] and Ali and Briggs [23][24][25]) on copper pin-fin tubes covering a range of data for 3 different condensing fluids (steam, ethylene glycol and R-113) and 11 pin-fin tube geometries. As in the model, the vapour-side, enhancement ratios are defined as the heat flux of the pin-fin tube divided by that of a plain tube with diameter equal to the pin root diameter and at the same vapour-side temperature difference.…”

“…1). Many experimental investigations on pin-fin tubes [20][21][22][23][24][25] have shown their superior heat transfer performance (up to 25%) over the equivalent integralfin tubes (i.e. with the same fin height, root diameter and longitudinal pin thickness and spacing).…”