Departure-Site Spacing for Liquid Droplets and Jets Falling in Thin-Film Heat Exchangers

Hu, Xiaolan; Jacobi, A.M.

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https://hdl.handle.net/2142/13186 Copy

Description

Title

Departure-Site Spacing for Liquid Droplets and Jets Falling in Thin-Film Heat Exchangers

Author(s)

• Hu, Xiaolan
• Jacobi, A.M.

Issue Date

1997-10

Keyword(s)

• liquid droplet patterns
• liquid flow patterns
• liquid-jet shapes

Abstract

When a liquid film falls from one tube to another below it, the flow can take the form of discrete droplets, individual jets or a continuous sheet. Experiments exploring the effects of thermophysical properties and geometrical parameters on the droplet and jet flow patterns are described. Measurements of droplet and jet departure-site spacing are reported for several fluids over a wide range of liquid flow rates, tube sizes and tube spacing. For the conditions of this study, departure-site spacing increased with decreasing Re for high-Ga fluids and was nearly independent of Re for low-Ga fluids. Departure-site spacing increased slightly with tube diameter for small tubes and was nearly independent of tube size for large tubes. Departure-site spacing was nearly independent of tube spacing for the entire range of experiments; however, a relation between jet shape, jet spacing and tube spacing was observed under some conditions. A qualitative study of liquid-jet shapes shows that this flow feature depends strongly on tube spacing, and comparisons to existing models suggest that further work in this area is needed.

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center CR-09

Type of Resource

text

Language

en

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http://hdl.handle.net/2142/13186

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