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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Experimental Research on Falling Film Flow Characteristic for Horizontal Drop-shaped Tube Bundle in Cold State

Get access (open in a dialog) DOI: 10.1615/IHTC15.tbf.008573
pages 7727-7739

Abstract

In order to better understand the mechanism of liquid falling film flow on the horizontal cylinder tube bundle, a new kind of drop-shaped tube is presented in this paper. Visualization experimental study was conducted to investigate the falling film flow characteristic of the drop-shaped tube in cold state. The effects of the tube type, Reynolds number and intertube spacing on the falling film modes, dimensionless wavelength and film thickness for the drop-shaped tube were studied. Compared with the circular tube, the more stable flow modes of the dropshaped tube can be obtain at a lower Reynolds number. The influence of intertube spacing is large on falling film modes, and smaller intertube spacing is help to form of the sheet mode. Under the conditions of this study, the falling wavelength increases with the decrease of Reynolds number and firstly increases then tends towards stability with increasing of intertube spacing. The study found that the falling wavelength of the drop-shaped tube is smaller than that of the circular tube by 12.97 percent at an intertube spacing of 5 mm. The film thickness of the drop-shaped tube grows with the increase of the Reynolds number and the growth rate decreases. The minimum film thickness of the drop-shaped tube is smaller than that of the circular tube. Finally the conclusions of this paper have a certain reference significance and value to the application of the shaped tube in the falling film evaporator for the seawater desalination system.