Heat transfer promotion in channel laminar flow employing a slab with slits and inclined ribs protruding across

Abstract

Purpose The purpose of this study is to promote laminar heat transfer from the channel heated through a slab with slits and inclined ribs protruding across. Design/methodology/approach The novel design of this study is performed through making the slits in the slab (C1–C3: with slits; C4–C6: without slits) and changing the vertical location of this slab (1/4, 1/2 and 3/4 channel height). The thermal fluid characteristics of all cases are analyzed for various Reynolds numbers (500, 1,000, 1,500 and 2,000) by the SIMPLE-C algorithm. Findings The results display that the ribbed slab effectively improves the heat transfer. The slits can modify the flow field in the vortexes around the inclined ribs and remove more heat from this zone to promote the heat transfer. As compared with C0 (without a slab), C2 (the slab with slits and inclined ribs protruding across located vertically on the 3/4 channel height) raises the averaged Nusselt number up to 27.7% at Re = 2,000. As compared with C4 (without slits), C1 (with slits) gains the maximum increase in the averaged Nusselt number by 5.07% at Re = 1,000. Research limitations/implications The constant thermo-physical properties of incompressible fluid and the steady flow are considered in this study. Practical implications The numerical results will profit the design of heated passageway using a slab with slits and inclined ribs protruding across to acquire better heat transfer promotion. Originality/value This slab with slits and inclined ribs protruding across can be applied to the heat transfer promotion and thus be viewed as a useful cooling mechanism in the thermal engineering.

Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes

“…Hoseinzadeh et al (2020, 2021) and Hoseinzadeh and Heyns (2020) used the ANSYS® software to separately analyze the thermo-structural fatigue of a heat exchanger, the turbulent heat transfer of pulsating Al 2 O 3 /water and the thermo-hydraulic properties inside a thermal photovoltaic solar cell system. Also, past articles (Perng et al , 2021; Perng et al , 2022) exercised the above code to simulate the thermal convection and fluid flows through the heated ducts equipped with various passive inserts for gauging the amelioration of thermal convection. The mathematical evaluations sufficiently agreed with the experimental gauge of the principle indices in these published articles, so this solving code is certified to competently resolve the physical model about the thermal convection and fluid flows inside the baffled- or ribbed-heated passageways.…”