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박수용(S.Y.Park),양도순(D.S.Yang),곽우진(W.J.Kwak),김창수(C.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
So far the distributor type injection pump have been used mainly in IDI passenger-car engines. But very-high-speed DI engines. for light-duty commer-cial vehicles has resulted in a new area of application. For this purpose. the injection pressure and injection rate have had to be increased by a factor of 2~3. with the pump outer dimensions remaineng unchanged. This paper reports on the select methods of injection systems to achieve the high-pressurization. the stability of injection pressure and the parts design process to reinforce the stiffness according to high-pressurization.<br/>
그루브-스크린 복합윅을 갖는 평판형 히트파이프의 열성능에 관한 실험적 연구
박수용(Park S. Y),부준홍(Boo J. H) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Thermal performance study was conducted on a flat strip heat pipe having a combined wick of a fin axial groove and a fine screen mesh. The dimension of the heat pipe was (L)150×(W)30×(T)4 ㎜ of which the container was made of aluminum alloy and the working fluid was acetone. The number of the fabricated groove was 48 and the width is 0.6㎜ and the height is 0.9㎜. Test was performed with varying thermal load and inclination angle(between -5 and 5 degree). The maximum thermal load observed were 200W and the thermal resistance was 0.05℃/W in the case. The result was compared with the one having no screen mesh.
박수용(Park S. Y.),부준홍(Boo J. H.) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A series of experiments was conducted to examine characteristics of a grooved flat-strip heat pipe having multiple heat sources. The inner grooves of the heat pipe have the aspect ratio of 1 to 2.5(0.42×1.05 ㎜) whose pitch was 0.6 ㎜. Four block heaters (10×20 ㎜) were placed in the evaporator section at intervals of 20 ㎜ and six different heating modes were tested. The maximum surface heat flux of 80 W/㎠ was achieved while the operating temperature was kept below 100℃. In the nearest heating mode (from the condenser location), the heat pipe exhibited more stable temperature distribution than the far heating mode where the heaters is located furthest from the condenser.
고온 유리 성형을 위한 직육면체형 Sodium 히트파이프의 실험
박수용(Park.S.Y),부준홍(Boo.J.H),김준범(Kim.J.B) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
To enhance isothermal characteristics of a glass-forming surface, a rectangular parallelepiped heat pipes<br/> were fabricated, tested, and analyzed. The working fluid was sodium and the wall material was stainless steel<br/> 304. The dimension of the heat pipe was 210(L)×140(W)×92(H)mm. Screen mesh was inserted to promote<br/> return of working fluid. The bottom side of heat pipe was heated electrically and the top side was cooled by<br/> liquid circulation. The temperature distribution at the bottom side was of major concern and was monitored to<br/> determine isothermal characteristics. The operating mode of sodium heat pipe was affected by the temperature<br/> of cooling zone, input heat flux, and the operating temperature of heat pipe. The heat pipe operated in a<br/> normal fashion as long as the heat flux, was over 5.78W/㎡, and the inside temperature of condenser part<br/> was above 95℃. The maximum temperature difference at the bottom surface was observed to be 32℃ when<br/> the operating temperature of the heat pipe was around 500℃.
박수용(Park S.Y.),정의국(Jung E.G.),부준홍(Boo J.H.),강환국(Kang H.K.),유정현(Yoo J.H.),박상훈(Park S.H.) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
High-temperature cylindrical stainless steel/sodium heat pipe was manufactured and tested under long-term operation. The container material was stainless steel 316L and the working fluid was sodium. The heat pipe was 25.4 mm in diameter and 1000 mm in length with a two-layer screen mesh wick. The evaporator part was 600 mm and the condenser part was 300 mm in length. Total measurement points on heat pipe were 15 points and 12 points were located in condenser part. The heat pipe was heated for 142 days(3400 hours) at 800℃ In the test period, the maximum temperature difference was increased from 18℃ to 28℃ and the maximum thermal resistance was as low as 0.01 5℃ V.