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SHUICHI TORII,Yoshino Hajime 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.1
Experimental study is performed on the turbulent heat transfer behavior of aqueous suspensionsof nanoparticles °owing through a horizontal circular pipe heated under constant heat °uxcondition. Consideration is given to the e®ects of nanoparticle concentration and Reynoldsnumber on heat transfer enhancement. It is found that (i) heat transfer enhancement is caused bysuspending nanoparticles, so that maximum value of the Nusselt number is over twice than that ofthe pure working °uid, (ii) graphene-oxide-nano°uid developed here is non-Newtonian °uid, and(iii) but the pressure drop for graphene-oxide-nano°uid is almost the same as that of the pureworking °uid, because volume fraction of particles is less than 1.0%.
Experimental Study on Thermal Transport Phenomenon of Nanofluids as Working Fluid in Heat Exchanger
SHUICHI TORII 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.1
This paper aims to study the convective heat transfer behavior of aqueous suspensions ofnanoparticles flowing through a horizontal tube heated under constant heat flux condition. Consideration is given to the effects of particle concentration and Reynolds number on heattransfer enhancement and the possibility of nanofluids as the working fluid in various heatexchangers. It is found that (i) significant enhancement of heat transfer performance due tosuspension of nanoparticles in the circular tube flow is observed in comparison with pure water asthe working fluid, (ii) enhancement is intensified with an increase in the Reynolds number andthe nanoparticles concentration, and (iii) substantial amplification of heat transfer performanceis not attributed purely to the enhancement of thermal conductivity due to suspension ofnanoparticles.
Microscopic Spray Characteristics in the Effervescent Atomizer with Two Aerator Tubes
Hyung Gon Kim,Toshiaki Yano,Kyu Keun Song,Torii Shuichi 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.9
An experimental study is performed on atomization characteristics and stable operating conditions for the injection of high viscous waste vegetable oil using an effervescent atomizer with 2 aerator tubes. Consideration is given to the effects of ALR and liquid viscosity on the velocity and mean diameter of the injected droplet. It is found that (i) as ALR increases, the axial velocity of the droplet is increased, while half-velocity width and SMD are decreased regardless of the change in liquid viscosities, (ii) the rate of fine drop distribution occupied in the total spray field is increased with an increase in ALR, and (iii) the effect of viscosity on the atomization characteristics is minor. Consequently, it is expected that the effervescent atomizer will exhibit an excellent atomization performance at the high ALR condition, regardless of liquid viscosities.
정병국(Byong-koog Jung),조태영(Tae-young Cho),송규근(Kyu-keun Song),정재연(Jae-youn Jung),김형곤(Hyung-gon Kim),鳥居 修一(Shuichi Torii) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The present study deals with the unique characteristics of hydrogen jet diffusion flames, such as split flames and reignition phenomenon. The split flames are composed of a small flamelet on the nozzle rim and a lifted main flame at downstream. When mass flow rates of fuel reach a critical point, a small-sized flamelet is found to remain in the vicinity of the nozzle exit and the flame reignition subsequent to blowout of main flame occurs repeatedly. In this study, the non-luminous hydrogen jet diffusion flames are visualized by using schlieren technique in order to analyze the combustion characteristics of hydrogen jet diffusion flames with focus on the flame reignition phenomenon.