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Your search keyword '"Skullong, Sompol"' showing total 138 results
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138 results on '"Skullong, Sompol"'

22. Thermo-hydraulic performance of a heat exchanger tube with inserted curved-wing tape vortex generators.

Author

Koolnapadol, Narin, Promvonge, Pongjet, Promthaisong, Pitak, Hoonpong, Panuwat, Khanoknaiyakarn, Chitakorn, Gururatana, Suabsakul, and Skullong, Sompol

Subjects
HEAT transfer, NUSSELT number, HEAT exchangers, REYNOLDS number, HEAT losses, VORTEX generators
Abstract

In the current study, thermal patterns and flow resistance in a heat exchange tube equipped with a curved-wing tape (CWT) vortex generator were experimentally analyzed to boost performance. A range of Reynolds numbers (Re) from 4130 to 25,370 was utilized in the experiment. The curved wings were arranged in forward array patterns for pitch length ratios (P/D = PR = 2.5, 2, and 1.5) and three wing attack angles (α = 10°, 20°, and 30°). The friction factor, f, and the Nusselt number, Nu, were utilized to quantify the pressure loss and heat transmission caused by the CWT insertion. The measured data reveal that utilizing the CWT resulted in a roughly 2.55-4.37 times greater increase in Nu than the smooth tube, whereas the rise in f is approximately 7.36-46.9 times. Raising the α value causes the Nu and f to trend upward, but increasing PR causes them to trend downward. The CWT's maximal thermal performance is approximately 1.58 at α = 10° and PR = 1.5. Correlations for f and Nu in the functional form of the CWT parameters have also been established. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Turbulent flow and heat transfer behaviors in a circular tube fitted with multiple V-baffles.

Author

Chompookham, Teerapat, Promvonge, Pongjet, Skullong, Sompol, Siriwan, Narin, Bubphachot, Bopit, Wansasueb, Kittinan, and Promthaisong, Pitak

Subjects
HEAT transfer in turbulent flow, JET impingement, TURBULENT flow, TURBULENCE, BOUNDARY layer (Aerodynamics), REYNOLDS number
Abstract

This article presents turbulent flow patterns and thermal behaviors in a circular tube mounted with 30° multiple V-baffles. The influences of V-baffle numbers (N) of 2, 3 and 4 with pitch ratios (PR) of 1.0, 1.5 and 2.0 for Reynolds number (Re) between 3000 and 20,000 were investigated numerically at a fixed blockage ratio, BR = 0.05. These simulated results were proposed in four sections: numerical validations, flow and thermal characteristics and thermal performance. It was visible that the multiple V-baffles can help induce the impinging jet leading to disrupting the boundary layer, increasing the fluid mixing, and then enhancing the heat transfer above the plain tube alone. The rises of the number of V-baffles and the lower baffle pitch length led to raising the heat transfer and friction loss. The maximum thermal performance was obtained around 2.06 at N = 4, PR = 1.0 and lower Re. [ABSTRACT FROM AUTHOR]

Published
2023
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