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Research Papers

Experimental Investigation on Freezing of Water Falling Film on Vertical Bank of Cold Horizontal Tubes

[+] Author and Article Information
Ahmed Hussain

Mechanical Engineering Department,
King Abdulaziz University,
05 Al Tahlia Street,
Rabigh 21911, Saudi Arabia

Abduzahir M. Selim

Mechanical Technology Department,
Jeddah College of Technology,
05 King Khalid Street, Jeddah 21494, Saudi Arabia

Manuscript received November 22, 2011; final manuscript received February 12, 2012; published online October 17, 2012. Assoc. Editor: Zahid Ayub.

J. Thermal Sci. Eng. Appl 4(4), 041006 (Oct 17, 2012) (7 pages) doi:10.1115/1.4006314 History: Received November 22, 2011; Revised February 12, 2012

The heat exchangers for ice formation on tube essentially consists of cold pipes submersed in stagnant water or in a cross flow of water. The heat exchanger considered here is a falling film one. Water falling film falls down over a set of vertical in-line cold horizontal tubes. The falling film main modes are droplets, jets, and sheet depending on its flow rate. The tubes are internally cooled by a controlled subzero temperature coolant. The coolant passes through the pipes in parallel. Water falling film freezes gradually outside the test tubes. The quantity of ice formed on the test tubes is observed, photographed, and measured at different times for different falling film modes. It has been noticed that the rate of ice formation decreases with time as ice accumulates on the test tubes. The overall heat transfer coefficient decreases as more ice accumulates on the test tubes.

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References

Figures

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Fig. 1

The idealized intertube falling film modes, as mentioned by Hu and Jacobi [2,3-2,3]

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Fig. 2

Tube section details as it was done by Intemann and Kazmierczak [9]

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Fig. 3

Schematic of the experimental setup of the test rig

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Fig. 4

A schematic of the tubes within the test section, liquid issues from the upper holed feeding tube, flows around a lower feeding tube that help ensure flow uniformly, and then falls through the test section, as was used by Hu and Jacobi [2,3-2,3]

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Fig. 5

Front view photo of ice accumulation on the test tubes

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Fig. 6

Side photo of ice accumulation on the test tubes

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Fig. 7

Ice mass formation for: Coolant flow rate m•c = 0.162 kg/s and jet mode versus time

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Fig. 8

Comparison between ice quantity for m•c = 0.16 kg/s and m•c = 0.38 kg/s

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Fig. 9

Comparison of the formed ice between droplet, jet, and sheet mode for m•c = 0.32 kg/s

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Fig. 10

Variation of the overall heat transfer coefficient with ice quantity for m•c = 0.38 kg/s

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Fig. 11

The effect of falling film flow rate (droplets, jets, and sheet modes) on heat transfer coefficient

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