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- 저자 : S. Wongwises (검색결과 2 건)
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S. LAOHALERTDECHA,A. S. DALKILIC,S. WONGWISES 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.4
The enhanced tube is a kind of the passive technique for improving the thermal performance of the heat exchangers with a little increase of the friction penalty. They have stated to use instead of the common smooth tubes for designing of the heat exchangers. The size of these heat exchangers can be reduced considerably by using the enhanced tubes instead of smooth tubes. Normally, they are divided into four groups: the corrugated tube, ribbed tube, grooved tube, and fluted tube. Compared with the common smooth tube, many researchers reported that use of the enhanced tubes dramatically increases the heat-transfer performance, both theoretically and experimentally. Focusing on the advantages of the enhanced tubes, this article summarizes the published studies on the heat-transfer and pressure-drop characteristics of the enhanced tubes, both experimental and quantitative investigations.
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Numerical study of laminar-forced convection of Al2O3 -water nanofluids between two parallel plates
M. Hemmat Esfe,A. A. Abbasian Arani,T. Azizi,S. H. Mousavi,S. Wongwises 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
Laminar-forced convection of Al 2 O 3 -water nanofluid between two parallel plates was studied numerically. The channel walls were assumed to be isothermal. The effective viscosity and thermal conductivity of nanofluid were considered as variables, and the effects of applying a variable properties model were investigatedby using two relatively new models. The numerical results were compared to the results obtained from a previous non-variable properties model. Also, the effects of nanoparticle size on the flow and heat transfer within the channel were investigated. The study was carried out using Reynolds numbers between 100-1000, nanoparticle diameters in the 15-75 nm range, and nanoparticle volume fractions in the range 0.01-0.05 nm. The numerical results show that using nanofluid could enhance heat transfer by up to 35 %, compared to the base fluid. In addition, reducing the nanoparticle diameter can enhance heat transfer by up to 15.9 %.
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