Development of heat exchanger for exhaust heat recovery using multiport tubes

2014 Fiscal Year Final Research Report

• Project/Area Number: 25889027
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Naval and maritime engineering
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: JIGE Daisuke 東京海洋大学, 海洋科学技術研究科, 助教 (30708368)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: 扁平多孔管 / ミニチャンネル / 沸騰熱伝達 / 伝熱促進

Outline of Final Research Achievements

The flow boiling heat transfer and frictional pressure drop characteristics of a refrigerant R32 in horizontal multiport tubes with circular, rectangular and triangular mini-channels are investigated experimentally. The effect of channels geometry on the frictional pressure drop and boiling heat transfer characteristics were clarified. The boiling heat transfer coefficient of rectangular channels increased with decreasing hydraulic diameter. The heat transfer coefficients of triangular and rectangular channels were found to be higher than those of circular channels at low mass velocities and low vapor qualities. The effect of channel geometries on enhancement of boiling heat transfer was small at high mass velocities and in the high vapor quality region. The dryout qualities of rectangular channels were lower than those of circular channels, and decreased with decreasing the channels size.

Free Research Field

熱工学