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유갑종,방창훈,김현우,Riu, Kap-Jong,Bang, Chang-Hoon,Kim, Hyun-Woo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.4
The evaporation cooling phenomenon of a droplet containing a surfactant on a heated surface has been studied experimentally. The two kinds of heater modules made of brass and Teflon$^{TM}$ were tested to investigate the cooling characteristics of droplet. Solutions of water containing Sodium Lauryl Sulfate(0 ppm, 100 ppm, 1000 ppm) were tested in the experiments. The results showed that the contact angle decrease as the concentration of surfactant increases. The tendency did not very with different heated solid materials. As initial temperature of the heated surface becomes high, time averaged heat flux increases and evaporation time decreases with the denser concentration of surfactant. Therefore, water with denser concentration of surfactant could be effective to cool flammable materials. However, the effect of surfactant becomes low as the material temperature is higher than the boiling temperature of water.
무산화 직화로 버너의 연소특성이 강재표면의 산화에 미치는 영향
박홍수,유갑종,Park, Heung Soo,Riu, Kap Jong 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.3
An experimental study for the two types of burners used in the non-oxidizing direct fired furnaces of the heat treatment process for the cold rolled plate has been carried out to investigate the combustion characteristics and the oxidization of the surface of steel plate. A steep temperature gradient and entrainment of residual oxygen were found near the heating surface in the flame of the nozzle mixing burner which has strong swirl velocity component. It was concluded that the elimination of the residual oxygen and the increase of the temperature of combustion gas on the heating surface are needed to enhance the performance of the burners for application to the non-oxidizing direct fired furnaces.
분리형 히트파이프의 저발열량 연료가스 예열시스템에 대한 적용연구
박흥수,유갑종,이진호,이용국,Park, Heung Soo,Riu, Kap Jong,Lee, Jin Ho,Lee, Yong Kuk 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.9
A separate heat pipe system capacity of 3,700kW has been developed and applied to preheating the blast furnace gas for recovery of the waste heat from boiler. The system is designed to preheat the blast furnace gas up to $126^{\circ}C$ by using tho boiler exhaust gas of which temperature is $180^{\circ}C{\sim}220^{\circ}C$. The arrangement of the fin tubes as well as the shape of the fin has been carefully determined to minimize the fouling problems. The heat pipe system was found to be stable in circulation of the working fluid and the range of the temperature variation of the preheated blast furnace gas was within $10^{\circ}C$. It was proved through a long-term test that the selected tube arrangement and the shape of the fins are proper to prevent the fouling problems and that the pay-back period of the system Is within one year.
이진호,박상희,유갑종,방창훈,Lee, Jin-Ho,Park, Sang-Hee,Riu, Kap-Jong,Bang, Chang-Hoon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.5
Conjugate heat transfer from a heat generating module ($31{\times}31{\times}7mm^3$) bonded through the module support on the floor of a parallel-plate channel(20mm high, 400mm wide, and 800mm long) to mixed convective air flow(0.2${\sim}$0.9m/s) is studied experimentally. The input power to the module is changed in a range 1.0${\sim}$4.5W, the floor thickness 0.2${\sim}$5mm, and the thermal resistance of module support, Rc:=0.06, 1.03 and 82.0K/W. Thermal conductance(Uc) of the board and convective thermal conductance($U_A$) from the module were derived, and the effect of V; Rc and t on Uc was investigated. It is found that the conjugate conductance (Uc) and the conductive heat transfer ratio ($Q_B$/Q) depend on the thermal resistance of the module support, the air velocity and the board thickness. The change of the module support resistance and the board thickness helps to elucidate the relative significance of heat transfer paths through the module support, the board, and from the board surface to the air. Additional information is investigated about the dependence of the heat transfer rate on the mixed convection parameter.
이동호(Tong Ho Lee),유갑종(Kap Jong Riu),김기완(Ki Wan Kim) 대한공업교육학회 1977 대한공업교육학회지 Vol.2 No.1
Generally packing gives rise to frictional heat. Thermal diffusivity is one of the main factors on calculation of heat transfer. In rubber, when compressive stress is applied, compressive as a factor of changing thermal diffusivity in rubber has not been reported. The factors being influenced on thermal diffusivity are density, specific heat and thermal conductivity. When compressive stress is applied, the variations of density and thermal conductivity are considered. Therefore compressive stress changes thermal diffusivity. In this paper, the relationship between thermal diffusivity and comperssive stress is studied through experiment. It is applied the well-known relation between temperature change and Fourier number in the case of transient conduction in heat transfer with negligible thermal resistivity. Thermal diffusivity α (㎠/sec) is found to vary with compressive stress P (㎏/㎠) according to the following equation; α = 1.434 × 10<sup>-3</sup> + 1.387 × 10<sup>-6</sup> P
Riu, Kap-Jong,Kim, Chul-Soo 慶北大學校 産業開發硏究所 1985 硏究報告 Vol.13 No.-
對流, 輻射 및 傳導 세가지 形態사이에 複雜한 相互作用을 包含하는 에너지 傳達問題는 最近 많은 注目을 받고 있다. 傳熱面에 있어서 熱流速을 增加시키는 目的으로서 여러가지 幾何學的인 形狀을 갖는 핀이 使用되고 있는데 特히 最近에 問題가 되는 相互輻射를 包含하는 輻射對流핀에 關한 硏究는 rectangular fin뿐이었다. 따라서 本 硏究에서는 trapezoidal fin의 輻射와 對流에 의한 熱傳達에 關하여 相互輻射도 包含하여 傳熱特性을 硏究하고, 여러 parameter가 有效度에 미치는 影響, 핀의 두께, 핀의 間隔, 周邊輻射溫度, 및 輻射率이 有效度에 미치는 影響, 그리고 全體有效度를 計算하여 rectangular fin과 比較檢討하였다. 그 結果 全體有效度는 rectangular fin보다 3∼10%程度 낮게 나타났으나 單位體積當 熱傳達은 rectangular fin보다 47∼67%程度 높게 나타났으며 無次元對流係數와 輻射傳導係數의 핀의 附着이 容易한 값의 範圍는 制限되어 졌다. 그리고 trapezoidal fin의 有效度는 w/L, T_0^*, b/L, 및 e의 값이 增加할때는 減少하였다.
劉甲鍾 慶北工業專門大學 1973 論文集 Vol.10 No.-
In order to solve problems on thermal stresses in a structural member, it is necessary to predict both of the stationary and transient temperature distributions. Problems on heat conduction are usually solved numerically by the well known finite difference method. But the method is not efficient for the problem in which a member has an arbitrary shaped boundary. In such a case the finite element method is a more powerful weapon, because we can use arbitrary shaped elements appropriate to express a complicated boundary. In this paper the author derive the general heat conduction equation for the thermal conductivity of the system by means of the finite element method. The most general partial-differential equation for heat conduction is used.
劉甲鍾,李永文 경북대학교 교육대학원 1976 논문집 Vol.6-7 No.-
A number of numerical and experimental solutions for the crack tip stress-intensity-factor have greatly widened the scope of application of fracture mechanics technology. Determination of stress-intensity-factor by stress analysis through photo-elastic method often provides the criterion avaiable to the actural design problems. In this paper, it is shown that photoelastic method can be used to determine stress-intensity-factors for multi-axis load condition. The stress distributions around the crack tip are obtained using shear difference method with specimen notch radius ρ=0.25㎜, and the results are used to determine the stress-intensity-factor K_Ⅰ, K_Ⅱ by method Ⅰ, Ⅱ, Ⅲ. Good agreements are obtained between the experimental results and theoritical values.