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Abdelaziz A. A. Gamil

Bio: Abdelaziz A. A. Gamil is an academic researcher from Cranfield University. The author has contributed to research in topics: Heat transfer & Nusselt number. The author has an hindex of 2, co-authored 10 publications receiving 31 citations.

Papers
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Journal ArticleDOI
13 Jun 2018-Energies
TL;DR: In this paper, the effect of the roughness element on heat transfer rate was simulated for six different heights and the optimum rib location and rib dimension determined, and the average Nusselt number was evaluated within and beyond the stagnation region to better quantify the heat transfer advantages of ribbed surfaces over smooth surfaces.
Abstract: The jet impingement technique is an effective method to achieve a high heat transfer rate and is widely used in industry. Enhancing the heat transfer rate even minimally will improve the performance of many engineering systems and applications. In this numerical study, the convective heat transfer process between orthogonal air jet impingement on a smooth, horizontal surface and a roughened uniformly heated flat plate is studied. The roughness element takes the form of a circular rib of square cross-section positioned at different radii around the stagnation point. At each location, the effect of the roughness element on heat transfer rate was simulated for six different heights and the optimum rib location and rib dimension determined. The average Nusselt number has been evaluated within and beyond the stagnation region to better quantify the heat transfer advantages of ribbed surfaces over smooth surfaces. The results showed both flow and heat transfer features vary significantly with rib dimension and location on the heated surface. This variation in the streamwise direction included both augmentation and decrease in heat transfer rate when compared to the baseline no-rib case. The enhancement in normalized averaged Nusselt number obtained by placing the rib at the most optimum radial location R/D = 2 was 15.6% compared to the baseline case. It was also found that the maximum average Nusselt number for each location was achieved when the rib height was close to the corresponding boundary layer thickness of the smooth surface at the same rib position.

16 citations

Journal ArticleDOI
TL;DR: In this article, the effects of two radiation models on the flame and liner-walls temperatures were analyzed in a Rolls-Royce-RB-183 turbofan engine, and the results indicated that the implementation of radiation models shrinks the flame peak temperature and altered temperature distribution across the liner.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the effects on flow and heat transfer rates when the inside surface of the vortex chamber was roughened by adding flow turbulators to its wall were discussed.

13 citations

Journal ArticleDOI
TL;DR: In this article, the effects of the mist fractions on heat transfer characteristics applied on a rotating U-channel with inclined ribs at an angle of 45° were investigated for Reynolds number values of 5000, 10000, 25000 and 40000.

3 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the numerical investigation of the injection of mist into an unconfined cooling steam jet to analyze the effects on the corresponding heat transfer characteristics, and show that controlling the uniformity of the injected mist will redefine the cooling characteristics.

3 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a state-of-the-art study on the numerous new and feasible technologies of solar energy applications in the agricultural sectors is presented, which discusses about the importance of solar energies as environmental clean technologies and the most reliable energy source.
Abstract: Solar energy is one of the cleanest sources of alternative energy. Due to high energy demand in one hand and environmental negative impact of fossil fuels, on the other hand, many countries consider the alternative energy sources as a suitable and feasible option in industry and domestic usage. It was discovered that the different applications of solar energy in industries are being accepted more than ever. The present study is a state of art on the numerous new and feasible technologies of solar energy applications in the agricultural sectors. It discusses about the importance of solar energy as environmental clean technologies and the most reliable energy source. This study covers different types of solar energy systems like as solar photovoltaic and solar thermal for pumping water, drying crops, cooling the storages and producing heating/cooling greenhouses. It has been proven that photovoltaic systems and/or solar thermal system would be the suitable options in agricultural application and especially for the distant rural area.

127 citations

DOI
01 Dec 2001
TL;DR: In this article, the authors measured the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets, and determined the effect of jet angle, Reynolds number, gap, and surface roughness on heat transfer and pressure loss.
Abstract: Measurements of the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets are presented. The test rig is designed to simulate impingement with crossflow in one direction. Jet angle is varied between 30, 60, and 90 deg as measured from the target surface, which is either smooth or randomly roughened. Liquid crystal video thermography is used to capture surface temperature data at five different jet Reynolds numbers ranging between 15,000 and 35,000. The effect of jet angle, Reynolds number, gap, and surface roughness on heat transfer and pressure loss is determined along with the various interactions among these parameters.

48 citations

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional swirl cooling model coupled with high temperature mainstream cascade channel and blade leading edge solid region is established to simulate the flow, heat transfer and stress characteristics.

39 citations

Journal ArticleDOI
01 Mar 2021-Energy
TL;DR: In this paper, the authors evaluated the performance of vortex chamber pumps for coal-water and Bingham fluids with different rheological parameters and determined the dependence of the pump efficiency on the Bingham viscosity and the yield stress.

32 citations

Journal ArticleDOI
TL;DR: In this article, the results of new experimental and theoretical investigations of puffing and micro-explosion of rapeseed oil/water droplets placed in ethanol and propane/butane mixture flames are presented.

22 citations