Cooling transients in a sudden-expansion channel with varied rates of wall transpiration

Tsai, Go-Long; Lin, Yi-Ting; Wang, H.W.; Lin, Yi‐Hsuan; Su, Yu-Chian; Yang, Jing‐Tang

doi:10.1016/j.ijheatmasstransfer.2009.08.006

Cited by 4 publications

(2 citation statements)

References 19 publications

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“… Using Peltier effect of semiconducting materials, in which one side of the material is heated while the other side is cooled, this can be done using Thermo-Electric Cooler (TEC) [5].  Cooling followed by sudden expansion in a condensation chamber [6].…”

Section: Dehumidificationmentioning

confidence: 99%

Water Purification in Atmospheric Water Generator

Ali¹,

Hamad²,

Ali

2022

Port-Said Engineering Research Journal

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Atmospheric Water Generator (AWG) is a machine that could save the Earth from running out of fresh water in the future. It is considered a perfect method for water production in countries that has high percentage of humidity. This machine extracts water from humid air using a power source that is used for decreasing the air temperature until reaching its dew point. At which water is condensed and collected to be used in different applications. But the collected water is considered distillate water as it doesn't contain any minerals that are very important for human health. Consequently, the collected water has to be treated to be compatible with the standards of drinking water. In this paper, spectrophotometer is applied to obtain the concentration of several constituents exist in the collected water, then water passes through ultraviolet unit to be disinfected, and finally minerals are added with specific quantities. The verification is achieved via simulation for mineral treatment process using Aspen HYSYS simulation program. While the validation is performed by experimental work for other processes. The results affirmed that the generated water is potable and satisfy the market needs according to the Egyptian standards. These results are also consistent with World Health Organization standards (WHO).

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Section: Dehumidificationmentioning

confidence: 99%

Water Purification in Atmospheric Water Generator

Ali¹,

Hamad²,

Ali

2022

Port-Said Engineering Research Journal

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“…They obtained that the average temperature over the transpiration area falls with an increase in the coolant injection ratio, whereas the average cooling effectiveness rise and There is an optimal injection rate, at which the coolant passing through pores with liquid state when the driving force for the coolant injection is the minimum and the cooling effectiveness is high. Tsai; Lin; Wang; Lin; Su and Yang [21] investigated the transient cooling process in a sudden-expansion channel with the injection of cold air from the porous bottom wall experimentally. They categorized flow features to four cooling patterns; the recirculation pattern, the elevated recirculation pattern, the transpiration pattern and film pattern.…”

Section: Figure 1 Scope Of Transpiration Coolingmentioning

confidence: 99%

Numerical Investigation of Heat Transfer From a Porous Plate With Transpiration Cooling

Kılıç¹

2017

Journal of Thermal Engineering

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The present study is focused on investigation of heat transfer from a porous plate by cooling of air and surface with transpiration cooling. Effects of Reynolds number of hot air (Re= 3035, 3200, 3300, 3580), effects of flow rate of water as a coolant (ṁwater= 0.000083, 0.000116, 0.000166, 0.000249 kg/s) on local wall temperature and cooling efficiency of porous flat and the system inside a rectangular channel with air as a hot gas stream and water as a coolant were investigated numerically. In this study; different from the literature, transpiration cooling was used as a cooling mechanism of air. It was observed from the results that increasing Reynolds number causes an increase on surface temperature and a decrease on cooling efficiency of porous plate and system. Increase of Reynolds number from Re=3035 to 9430 causes a decrease of efficiency of the system of 13.7%. Increasing water flow rate nine times causes not only a decrease on average surface temperature of 1.1% but also an increase of 6.5% on efficiency of porous plate and an increase of 19.1% on cooling efficiency of the system. Numerical results prepared by RNG k-ε turbulence model generally have a good approximation with experimental results.

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2016

Liquid Acquisition Devices for Advanced in-Space Cryogenic Propulsion Systems

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Cooling transients in a sudden-expansion channel with varied rates of wall transpiration

Cited by 4 publications

References 19 publications

Water Purification in Atmospheric Water Generator

Water Purification in Atmospheric Water Generator

Numerical Investigation of Heat Transfer From a Porous Plate With Transpiration Cooling

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