Heat Transfer and Pressure Drop Performance of Finned Tube Bundles

Abstract

The heat transfer and pressure drop performance of two types of finned tubes used in the air-conditioning industry are reported for 14 different bundle configurations. Twelve of these configurations contained a new type of finned tube called K-Y and two contained a more conventional pin fin. A unique characteristic of all these configurations is zero or negative fin-tip clearances. A comparison of the performance of these air-conditioning type finned tubes with negative fin-tip clearance is then made with the performance of typical air-cooled heat exchanger tubes used in the process and power industries. Both the heat transferred and the pressure drop are substantially higher with the air-conditioning configurations; the heat transfer coefficient is superior even to plain tubes. The very high heat transfer performance is more the result of the negative fin-tip clearance than the fin shape or type.

Numerical Simulation of the Convective Heat Exchange and Aerodynamics of the Surfaces with the Lamellar-Split Ribbing

“…2017. № 9(1231) ISSN 2078-774X (print) Енергетичні та теплотехнічні процеси й устаткування вания [3][4][5], разрезки на короткие участки [6][7][8][9][10].…”

“…Например, по данным работ [3][4][5][6][7][8][9], разрезка вершин кольцевых ребер трубы позволяет увеличить интенсивность теплоотдачи на (12-36) %, однако, при этом наблюдается опе-режающий рост аэродинамического сопротивле-ния по сравнению с ростом интенсивности тепло-обмена, что в целом заметно снижает суммарную теплоаеродинамическую эффективность всей по-верхности.…”

“…Работы, посвященные экспериментальному исследованию теплоаэродинамических характери-стик поверхностей с пластинчато-разрезным ореб-рением, позволили показать влияние разрезки ре-бер на процессы теплообмена и аэродинамики [1][2][3][4][5].…”

Numerical investigations for the optimization of serrated finned-tube heat exchangers

“…Additional data about both arrangements for heat recovery systems were presented by Rabas et al [7]. Eckels and Rabas [8] studied the heat transfer and pressure drop of many finned tube bundle configurations including the serrated finned-tubes. Holtzapple and Carranza [9] and Holtzapple et al [10] provided friction and heat transfer data for spine finned tubes of copper.…”

Enhancement of Heat Transfer in the Bundles of Transversely-Finned Tubes

“…A great many works on developing intensified surfaces are associated with setting up conditions for the breakdown of thickened boundary layers on relatively high fins and for the organization of a developed vortex flow, if possible, over the entire surface. Such conditions are attained by corrugation of the transverse fins (Tolubinskiy & Lyogkiy, 1964), their perforation (Migai et al, 1992;Eckels & Rabas, 1985), cutting into short sections with ends bent to the opposite sides (Taranyan et al, 1972;Sparrow & Myrum, 1985) and with the use of the so-called segment finning. Analyzing these developmental works and related investigations allows us to note the following.…”