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- 저자 : 羅基大 (검색결과 3 건)
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羅基大,李行男 조선대학교 생산기술연구소 1988 生産技術硏究 Vol.10 No.1
There arc three major pipe flow problems in hydraulic engineering, that is, determination of pipe diameter, flow rate and head loss, Many theoretical and experimental formulas were proposed to determine above variables by many researchers, but it is hard to get direct solution from these formulas. So this paper is attempted to get simple and explicit formula for the friction factor in transient zone of the uniform turbulent pipe flow. For this, friction factor of Commercial pipes were obtained by experiment clue to their pipe diameters and materials, and them cornpated with the other's results.
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羅基大 조선대학교 생산기술연구소 1991 生産技術硏究 Vol.13 No.2
An experimental study of heat transfer effects of impinging jet IS made to investigate the effect of inclination angle of heater surface. The heater surface is situated at the position of H/D = 4.5 from the nozzle outlet. The inclination angles are measured from the center line of the jet, and the non-dimensional values are D_(n)=0.5, 0.67, 0.83,1.00. The Reynolds number varies from 1.4×10⁴ to 3.4×10⁴ for the inclined heater surface with the constant heat flux condition. As a result, the main conclusions obtained are as follows; (1) For the same non-dimensional inclination angle, the heat transfer of tne downward heater Surface is higher than tuat of the upward heater surface. (2) For the same non-dimensional inclination angle, the heat transfer becomes higher with the Reynolds number in creasing. (3) The 2nd extreme heat transfer point appears at the position of X/D=6~8 from the staqnation point. (4) The heat tranfer effect is best wnen the non-dimensional inclination angle is D_(n)=0.83, for the same jet velocity (5) The following non-dimensional empirical equation is dedi Iced for the Nusselt number, Reynold Humber, Prandt] number and the non-dimensional inclination angle : N_(u)=F(D_(n))R^(e0.88)P^(r0.33) for F(D_(n))=-0.1022+0.4911 D_(n)-0.3394D^(n2) (0.50≤D_(n)≤1.00).
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吳栗權,羅基大 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
Applicability of a theoretical model, based on the fundamental governing equations of fluid motion is investigated to prodict two-phase bubbly air-sater flow structure through vertical columns. The model predictions are compared to experimental data for a wide range of foow parameters. The relative importance of various modes of interfacial momentum transfer, under different flow conditions, is also examined. It is found that correct estimation of the interfacial momentum transfer is necessary for agreement between the predictions and experimental data. The present study shows that the flow structure for air-water flows through vertical columns depend on the inlet flow conditions. The model predicts the experimentally observed trends well and in most cases the experimental data of local liquid velocity and gas volume fraction agree well with the calculated values.
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