An experimental investigation of flow boiling in an asymmetrically heated rectangular microchannel

Journal Article · Tue Aug 15 04:00:00 EDT 2006 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/j.expthermflusci.2006.03.007· OSTI ID:20770233

Huh, Cheol; Kim, Moo Hwan ^[1]

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1. Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyoja-dong, Namgu, Pohang, Kyoungbuk 790-784 (Korea, Republic of)

By using unique experimental techniques and carefully constructed experimental apparatus, the characteristics of flow boiling of water in microscale were investigated using a single horizontal rectangular microchannel. A polydimethylsiloxane rectangular microchannel (D{sub h}=103.5 and 133{mu}m) was fabricated by using the replica molding technique, a kind of soft lithography. A piecewise serpentine platinum microheater array on a Pyrex substrate was fabricated with the surface micromachining MEMS technique. Real time flow visualization of the phase change phenomena inside the microchannel was performed using a high speed CCD camera with microscope. The experimental local boiling heat transfer coefficients were studied, and single bubble inception, growth, and departure, as well as elongated bubble behavior were analyzed to elucidate the microscale heat transfer mechanisms. Tests were performed for mass fluxes of 77.5, 154.9, and 309.8kg/m{sup 2}s and heat fluxes of 180-500kW/m{sup 2}. The effects of mass flux, heat flux, and vapor qualities on flow boiling heat transfer in a microchannel were studied. (author)

• OSTI ID: 20770233
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 8 Vol. 30; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BUBBLES
FLOW VISUALIZATION
HEAT FLUX
HEAT TRANSFER
MASS TRANSFER
NUCLEATE BOILING
OSCILLATIONS
PRESSURE DROP
RECTANGULAR CONFIGURATION
TUBES
TWO-PHASE FLOW
WATER