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Research Papers: Two-Phase Flow and Heat Transfer

Dynamic Behavior of a Small Water Droplet Impact Onto a Heated Hydrophilic Surface

[+] Author and Article Information
El-Sayed R. Negeed

Faculty of Engineering, Department of Mechanical Engineering,
Jeddah, King Abdulaziz University,
P.O. Box 80204,
Jeddah 21589, Saudi Arabia;
Department of Reactors,
Nuclear Research Center,
Atomic Energy Authority,
P.O. Box 13759,
Cairo, Egypt
e-mail: s.negeed@gmail.com

M. Albeirutty, Sharaf F. AL-Sharif

Center of Excellence in Desalination Technology,
King Abdulaziz University,
P.O. Box 80200,
Jeddah 21589, Saudi Arabia

S. Hidaka, Y. Takata

International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER)
and Department of Mechanical Engineering,
Kyushu University,
744 Motooka, Nishi-ku,
Fukuoka 819-0395, Japan

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 15, 2015; final manuscript received July 26, 2015; published online January 12, 2016. Assoc. Editor: Gennady Ziskind.

J. Heat Transfer 138(4), 042901 (Jan 12, 2016) (11 pages) Paper No: HT-15-1037; doi: 10.1115/1.4032147 History: Received January 15, 2015; Revised July 26, 2015

The aim of this study is to investigate the influence of the surface wettability on the dynamic behavior of a water droplet impacting onto a heated surface made of stainless steel grade 304 (Sus304). The surface wettability is controlled by exposing the surfaces to plasma irradiation for different time periods (namely, 0.0, 10, 60, and 120 s). The experimental runs were carried out by spraying water droplets on the heated surface where the droplet diameter and velocity were independently controlled. The droplet behavior during the collision with the hot surface has been recorded with a high-speed video camera. By analyzing the experimental results, the effects of surface wettability, contact angle between impacting droplet and the hot surface, droplet velocity, droplet size, and surface superheat on the dynamic behavior of the water droplet impacting on the hot surface were investigated. Empirical correlations are presented describing the hydrodynamic characteristics of an individual droplet impinging onto the heated hydrophilic surfaces and concealing the affecting parameters in such process.

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Figures

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Fig. 1

Schematic diagram of layout of experimental apparatus

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Fig. 2

Photographs of Sus304 surfaces treated by exposing them to plasma irradiation for about different exposure durations, τpls: (a) τpls = 0.0 s (i.e., untreated surface), (b) τpls = 10 s, (c) τpls = 60 s, and (d) τpls = 120 s (i.e., treated surface)

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Fig. 3

Experimental apparatus for measuring static droplet–solid contact angle

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Fig. 4

Droplet–solid contact angle

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Fig. 5

Behavior of droplet impacting onto superheated Sus304 surface for 700 μm droplet diameter, 1.0 m/s droplet velocity, and 200 K surface superheat and for: (a) τpls = 0.0 s and (b) τpls = 120 s

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Fig. 7

Effects of surface wettability and droplet velocity on the droplet–hot surface contact time for 700 μm droplet diameter and for: (a) τpls = 0.0 s, (b) τpls = 10 s, (c) τpls = 60 s, and (d) τpls = 120 s

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Fig. 8

Relationship between the experimental and the predicted results for the maximum diameter of spreading droplet and the droplet–hot surface contact time

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Fig. 9

Comparison between the present results and results obtained by other researchers for the effects of Kd and surface wettability for different exposure durations on the: (a) maximum diameter of spreading droplet and (b) droplet–hot surface contact time

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Fig. 6

Effects of surface wettability and droplet velocity on the maximum diameter of spreading droplet for 700 μm droplet diameter and for: (a) τpls = 0.0 s, (b) τpls = 10 s, (c) τpls = 60 s, and (d) τpls = 120 s

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