The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement

The Nano materials play a very important role in the heat transfer enhancement. An experimental investigation has been done to understand the behaviors of nano and micro materials on critical heat flux. Pool boiling experiments have used for several concentrations of nano and micro particles on a 0...

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Autores principales:	Enas M. Sharef, Jamal M. A Ali
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2019
Materias:	Critical Heat Flux (CHF), Distilled water, Nano fluids, Pool boiling, (Ni-Cr) wire heater, Nano particles deposited layers. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/e96847522e104eb0a23bf46822df39e2
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spelling	oai:doaj.org-article:e96847522e104eb0a23bf46822df39e22021-12-02T10:50:05ZThe Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement1818-11712312-0789https://doaj.org/article/e96847522e104eb0a23bf46822df39e22019-03-01T00:00:00Zhttp://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/425https://doaj.org/toc/1818-1171https://doaj.org/toc/2312-0789 The Nano materials play a very important role in the heat transfer enhancement. An experimental investigation has been done to understand the behaviors of nano and micro materials on critical heat flux. Pool boiling experiments have used for several concentrations of nano and micro particles on a 0.4 mm diameter nickel chrome (Ni-Cr) wire heater which is heated electrically at atmospheric pressure. Zinc oxide(ZnO) and silica(SiO2) were used as a nano and micro fluids with concentrations (0.01,0.05,0.1,0.3,0.5,1 g/L), a marked enhancement in CHF have been shown in the results for nano and micro fluids for different concentrations compared to distilled water. The deposition of the nano particles on the heater surface was the reason behind the enhancement of the wettability of the surface which will increase the CHF, this nano particles deposition will form a porous layer and the mechanism of the formation of this layers is that as vapor bubbles grow, the evaporating liquid in the micro layer leaves behind Nano particles which then will be concentrated at the base of the bubble to form this pours layer. The higher wettability can produce CHF enhancement, the enhancement ratio of Nano fluid is observed to be higher than that of micro fluid, the optimum enhancement ratios of nano fluid is (1 g/l) which observed to be 9.2 % for ZnO and 8.7% for Sio2, and also (1 g/l) for micro fluid which observed to be 8.1%for ZnO and 7.4%for SiO2. Enas M. SharefJamal M. A AliAl-Khwarizmi College of Engineering – University of BaghdadarticleCritical Heat Flux (CHF), Distilled water, Nano fluids, Pool boiling, (Ni-Cr) wire heater, Nano particles deposited layers.Chemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 15, Iss 1 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Critical Heat Flux (CHF), Distilled water, Nano fluids, Pool boiling, (Ni-Cr) wire heater, Nano particles deposited layers. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Critical Heat Flux (CHF), Distilled water, Nano fluids, Pool boiling, (Ni-Cr) wire heater, Nano particles deposited layers. Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Enas M. Sharef Jamal M. A Ali The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
description	The Nano materials play a very important role in the heat transfer enhancement. An experimental investigation has been done to understand the behaviors of nano and micro materials on critical heat flux. Pool boiling experiments have used for several concentrations of nano and micro particles on a 0.4 mm diameter nickel chrome (Ni-Cr) wire heater which is heated electrically at atmospheric pressure. Zinc oxide(ZnO) and silica(SiO2) were used as a nano and micro fluids with concentrations (0.01,0.05,0.1,0.3,0.5,1 g/L), a marked enhancement in CHF have been shown in the results for nano and micro fluids for different concentrations compared to distilled water. The deposition of the nano particles on the heater surface was the reason behind the enhancement of the wettability of the surface which will increase the CHF, this nano particles deposition will form a porous layer and the mechanism of the formation of this layers is that as vapor bubbles grow, the evaporating liquid in the micro layer leaves behind Nano particles which then will be concentrated at the base of the bubble to form this pours layer. The higher wettability can produce CHF enhancement, the enhancement ratio of Nano fluid is observed to be higher than that of micro fluid, the optimum enhancement ratios of nano fluid is (1 g/l) which observed to be 9.2 % for ZnO and 8.7% for Sio2, and also (1 g/l) for micro fluid which observed to be 8.1%for ZnO and 7.4%for SiO2.
format	article
author	Enas M. Sharef Jamal M. A Ali
author_facet	Enas M. Sharef Jamal M. A Ali
author_sort	Enas M. Sharef
title	The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
title_short	The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
title_full	The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
title_fullStr	The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
title_full_unstemmed	The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement
title_sort	effect of micro and nano material on critical heat flux (chf) enhancement
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2019
url	https://doaj.org/article/e96847522e104eb0a23bf46822df39e2
work_keys_str_mv	AT enasmsharef theeffectofmicroandnanomaterialoncriticalheatfluxchfenhancement AT jamalmaali theeffectofmicroandnanomaterialoncriticalheatfluxchfenhancement AT enasmsharef effectofmicroandnanomaterialoncriticalheatfluxchfenhancement AT jamalmaali effectofmicroandnanomaterialoncriticalheatfluxchfenhancement
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The Effect of Micro and Nano Material on Critical Heat Flux (CHF) Enhancement

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