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Title: Heat transfer enhancement and pressure drop of the horizontal concentric tube with twisted wires brush inserts
Authors: Naphon P.
Suchana T.
Keywords: Concentric tube
Copper wires
Enhancement of heat transfer
Fluid temperatures
Heat transfer characteristics
Heat transfer enhancement
Hot water
Inner diameters
Iron cores
Plain tubes
Spacer lengths
Test runs
Twisted wire
Working fluid
Cold working
Heat exchangers
Heat transfer coefficients
Hot working
Pressure drop
Pressure effects
Reynolds number
Tubes (components)
Issue Date: 2011
Abstract: In the present study, the heat transfer characteristics and the pressure drop of the horizontal concentric tube with twisted wires brush inserts are investigated. The inner diameters of the inner and outer tubes are 15.78 and 25.40 mm, respectively. The twisted wire brushes are fabricated by winding a 0.2 mm diameter of the copper wires over a 2 mm diameter of two twisted iron core-rod with three different twisted wires densities of 100, 200, 300 wires per centimeter. The plain tube with full-length twisted wires brush and regularly spaced twisted wires brush with 30 cm spacer length inserts are tested. Cold and hot water are used as working fluids in shell side and tube-side, respectively. The test runs are performed at the hot water Reynolds number ranging between 6000 and 20000. The inlet cold and hot water temperatures are 15, 20 °C, and between 40 and 50 °C, respectively. Effect of twisted wires density, inlet fluid temperature, and relevant parameters on heat transfer characteristics and pressure drop are considered. Twisted wire brushes insert have a large effect on the enhancement of heat transfer, however, the pressure drops also increase. © 2010 Elsevier Ltd.
ISSN: 7351933
Appears in Collections:Scopus 1983-2021

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