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손강필(Kang-Pil Son),안수환(Soo Whan Ahn),최수영(Soo-Young Choi) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
This paper is to present the results of a comprehensive study on heat transfer in annuli with spirally corrugated inner tubes in tile turbulent regime. Tube surface-temperature measurements were used to explain the enhancement phenomena in the annuli with several different corrugated tubes. Nusselt numbers were between 1.1 and 2 times the smooth annulus values. These enhancement values can be used to determine the appropriate range of applicability for spirally corrugated annuli.
파형관을 가진 이중 환형관의 열전달에 관한 실험적 연구
안수환,손강필 대한설비공학회 2002 설비공학 논문집 Vol.14 No.8
This paper is to present the results of a comprehensive study on heat transfer in annuli with spirally corrugated inner tubes in the turbulent regime. Tube surface-temperature measurements were used to explain the enhancement phenomena in the annuli with several different corrugated tubes. Nusselt numbers were between 1.1 and 2 times the smooth annulus values. These enhancement values can be used to determine the appropriate range of applicability for spirally corrugated annuli.
사각 덕트에서 거칠기 형상이 마찰계수와 열전달에 미치는 효과
안수환,손강필 대한설비공학회 2001 설비공학 논문집 Vol.13 No.5
A comparison of fully developed heat transfer and friction factor characteristics has been made in rectangular ducts with ones roughened by five different shapes. The effects of rib shape geometries and Reynolds number are examined. The rib height-to-duct hydraulic diameter, pitch-to height ratio, and aspect ratio of channel width to height are fixed at $e$/De=0.0476, P/$e$=8, and W/H=2.33, respectively. To understand the mechanisms of the heat transfer enhancements, the measurements of the friction factors are also conducted in the smooth and rough channels. The data indicates that the triangular type rib has a substantially higher heat transfer performance than any other ones in the range we studied.
왕복운동을 하는 사각채널에서 거칠기 배열이 열전달에 미치는 효과
안수환,손강필,진용수,김성태 대한설비공학회 2003 설비공학 논문집 Vol.15 No.6
This paper describes a detailed experimental investigation of heat transfer in a reciprocating rectangular channel fitted with rib structures with particular reference to the design of a piston for marine propulsive diesel engine. The parametric test matrix involves Reynolds number, reciprocating frequency, and reciprocating radius, respectively in the ranges, 1,000~6,000, 1.7~2.5 Hz, and 7~15 cm with four different rib arrangements. The rib arrangements have considerable influences on the heat transfer in the reciprocating channel due to the modified vortex flow structure. The experimental data confirm that the increases in the heat transfer can be seen in order of Case (b), Case (c), Case (d), and Case (a).
안수환,손강필 한국마린엔지니어링학회 2002 한국마린엔지니어링학회지 Vol.26 No.6
The influence of reciprocating frequency and radius on heat transfer in the roughened rectangular channel is experimentally investigated. The aspect ratio (width/height) of the duct is 2.33 and the rib height is one fifteenth of the duct height. And the ratio of rib-to-rib distance to rib height is 10. The discrete ribs were periodically attached to the button wall of the duct with a parallel orientation. The parametric test matrix involves Reynolds number, reciprocating, and reciprocating radius, in the ranges, 1,000∼6,000, 1.7∼2.5 HB and 7∼15cm, respectively. The combined effects of reciprocating frequency and reciprocating radius have considerable influence on the heat transfer due to the modified vortex flow structure.