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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

ENHANCEMENT OF HFE-7200 POOL BOILING HEAT TRANSFER ON COPPER SURFACES WITH NANOPARTICLE COATINGS

Zhen Cao
Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden

Zan Wu
Department of Energy Sciences, Lund University, P.O. Box 118, Lund, SE-22100, Sweden

Anh Duc Pham
Department of Energy Sciences, Lund University, Lund, Sweden; Department of Biomedical Science, Malmö University, Malmö, Sweden

Calle Preger
Solid State Physics and NanoLund, Lund University, Lund, Sweden

Tautgirdas Ruzgas
Department of Biomedical Science, Malmö University, Malmö, Sweden

Cathrine Alber
Department of Biomedical Science, Malmö University, Malmö, Sweden

Sahar A. Abbood
Department of Energy Sciences, Lund University, P.O. Box 118, Lund, SE-22100, Sweden

Bengt Sunden
Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden

DOI: 10.1615/IHTC16.bae.023071
pages 1341-1347


KEY WORDS: Dielectric liquid, Pool boiling, Nanoparticle coating

Abstract

Saturated pool boiling heat transfer of HFE-7200 is investigated experimentally on copper surfaces with nanoparticle coatings at atmospheric pressure. The coatings are generated by an electrophoretic deposition method. Two modified surfaces are prepared with Cu-Zinc nanoparticles of 0.3 mg and 0.6 mg, respectively. During the deposition, ethanol works as the solvent while the electrical potential and deposition time are controlled as 9.5 V and 30 min, respectively. The experimental results show heat transfer is considerably enhanced by the nanoparticle coatings. The surface with 0.6 mg nanoparticles (EDS-2) performs better than the surface with 0.3 mg nanoparticles (EDS-1), and a maximum 140% heat transfer enhancement is achieved on the surface EDS-2 compared with the SS. However, the critical heat flux is not enhanced by the coatings but even slightly decreased. A high speed visualization is employed to capture bubble behavior. It is found that bubbles on EDS-1 and EDS-2 have smaller sizes and higher departure frequency than those on the SS before reaching the critical heat flux. However, at critical heat fluxes, a vapor blanket appears on all surfaces.

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