Local Nusselt number and temperature field distribution within the compound duct with gap have been measured. Measurement of air and wall temperature span a range of gap width from 2mm to 6mm. Also, the Reynolds number is variated from 20,000 to 40,0000. In order to observe the correlations between gap width and turbulent heat transfer, the present measurement has tried to verify the enhancement effect of heat transfer when a gap exists within the compound channel. From this measurement, we could see that the pulsating flow has generated a strong turbulent flow mixing within the compound channel. And the turbulent flow mixing in the pulsating flow plays an effective role of enhancing the Nusselt number by making the fluid temperature uniformly within the compound channel.

Abstract
 1. 서론
 2. 실험장치 및 방법
  2.1 복합덕트 형상 및 실험장치
  2.2 실험방법
 3. 실험결과 및 고찰
 4. 결론
 참고문헌

• 변재기(고려대학교 기계공학부) | J.K. Byun
• 최영돈(고려대학교 기계공학부) | Y.D. Choi
• 곽동걸(강원대학교 방재전문대학원) | D.K. Kwak
• 신종근(한중대학교 기계자동차공학과) | J.K. Shin 교신저자