The purpose of this study was investigated heat flow and heat transfer coefficient characteristics of around tube when changing the tube arrangement type and heat transfer area. When  ≒1∼4, convective heat transfer coefficient of staggered and aligned arrangement was increased. Growth rate of the heat transfer coefficient becomes smaller in case of ≒5∼8 because a change in the turbulence was very small. At the staggered arrangement, all tubes were always arranged in front of the open passage between the back of the tube. Then, the entire surface area of the tube was exposed to the main flow. Thus growth rate of heat transfer coefficient appear larger than aligned arrangement.

• 금국빈(Department of Mechanical Engineering, Inha University) | Kuk-Bin Keum
• 박태준(Department of Mechanical Engineering, Inha University) | Tae-Joon Park
• 김도현(Regional Innovation Center for Automobile, Powertrains Inha University) | Do-Hyun Kim
• 이관석(Division of Mechanical and Automotive, Kongju National University) | Kwan-Seok Rhee
• 금성민(School of Mechanical and Automotive Engineering, Halla University) | Sung-Min Kum Corresponding Author