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Research Papers

Numerical Investigation of Two-Phase Flow Over Unglazed Plate Collector Covered With Porous Material of Wire Screen for Solar Water Heater Application

[+] Author and Article Information
T. Salameh

Department of Sustainable and
Renewable Energy Engineering,
College of Engineering,
University of Sharjah,
Sharjah, United Arab Emirates

Y. Zurigat

Department of Mechanical Engineering,
University of Jordan,
Amman, Jordan

A. Badran

Department of Mechanical Engineering,
Philadelphia University,
Amman, Jordan

C. Ghenai, M. El Haj Assad

Department of Sustainable and Renewable
Energy Engineering,
College of Engineering,
University of Sharjah,
Sharjah, United Arab Emirates

Khalil Khanafer

Mechanical Engineering Department,
Australian College of Kuwait,
Mishref, Kuwait;
Advanced Manufacturing Lab (AML),
School of Engineering,
University of Guelph,
Guelph, ON N1G 2W1, Canada

Kambiz Vafai

Mechanical Engineering Department,
University of California,
Riverside, CA 92521
e-mail: vafai@engr.ucr.edu

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 3, 2018; final manuscript received October 2, 2018; published online November 14, 2018. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 141(3), 031009 (Nov 14, 2018) (9 pages) Paper No: SOL-18-1154; doi: 10.1115/1.4041737 History: Received April 03, 2018; Revised October 02, 2018

This paper presents three-dimensional numerical simulation results of the effect of surface tension on two-phase flow over unglazed collector covered with a wire screen. The homogenous model is used to simulate the flow with and without the effect of porous material of wire screen and surface tension. The Eulerian-Eulerian multiphase flow approach was used in this study. The phases are completely stratified, the interphase is well defined (free surface flow), and interphase transfer rate is very large. The liquid–solid interface, gas–liquid interface, and the volume fraction for both phases were considered as boundaries for this model. The results show that the use of porous material of wire screen will reduce the velocity of water flow and help the water flow to distribute evenly over unglazed plate collector. The possibility of forming any hot spot region on the surface was reduced. The water velocity with the effect of surface tension was found higher than the one without this effect, due to the extra momentum source added by surface tension in longitudinal direction. The use of porous material of wires assures an evenly distribution flow velocity over the inclined plate, therefore helps a net enhancement of heat transfer mechanism for unglazed solar water collector application.

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References

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Figures

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Fig. 1

(a) Inclined rectangular unglazed plate with a porous material of wire screen placed on the top side and (b) wire screen shape and (c) computational domain with boundaries conditions

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Fig. 2

Grid independence study based on the average velocity

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Fig. 3

Velocity distribution profile at 30 deg inclined unglazed plate for (a) experimental [23] and numerical results at flow rate 1.5 (L/min) and 17 deg, 30 deg, and 45 deg tilt angles along the length plate (longitudinal direction) and (b) numerical results over plate at the outlet side for three different cases

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Fig. 4

Numerical velocity profiles on smooth inclined unglazed plate at different inclination angles (a) 2D velocity contours at 30 deg tilt angle for longitudinal and transverse directions (b) velocity profiled at 17 deg, 30 deg, and 45 deg tilt angles for transverse direction, and (c) contours for water and air volume fractions

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Fig. 5

Velocity contours at 30 deg with wire screen and without surface tension (a) lateral direction and (b) longitudinal and transverse directions

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Fig. 6

Velocity distribution profiles for the flow at 30 deg using porous material of wire screen with surface tension (a) lateral direction and (b) longitudinal and transverse directions

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Fig. 7

The effect of the Kloss of porous material of wire screen on the flow velocities

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Fig. 8

Velocity distribution for the flow at 30 deg using porous material of wire screen in longitudinal direction (a) with surface tension effect and (b) without surface tension effect

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Fig. 9

Numerical results for temperature distribution profile at 30 deg inclined unglazed plate for three different cases at the outlet side

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Fig. 10

Temperature distribution for the flow at 30 deg using porous material of wire screen in longitudinal direction (a) smooth inclined unglazed plate (b) with surface tension effect (c) without surface tension effect

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