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research-article

Pool boiling heat transfer characteristics of inclined pHEMA (polyhydroxyethylmethacrylate) coated surfaces

[+] Author and Article Information
Abdolali Khalili Sadaghiani

Mechatronics Engineering Program Sabanci University. Orta Mahalle, Tuzla 34956, Istanbul
akhalilisadaghiani@sabanciuniv.edu

Ahmadreza Motezakker

Mechatronics Engineering Program Sabanci University. Orta Mahalle, Tuzla 34956, Istanbul
ahmadrezam@sabanciuniv.edu

Alsan Volkan Ozpinar

Materials Science & Nanoengineering Program Sabanci University. Orta Mahalle, Tuzla 34956, Istanbul
avozpinar@sabanciuniv.edu

Gozde Ozaydin-Ince

Faculty of Engineering and Natural Sciences Sabanci University. Orta Mahalle, Tuzla 34956, Istanbul
gozdeince@sabanciuniv.edu

Ali Kosar

Mechatronics Engineering Program Center of Excellence for Functional Surfaces and Interfaces Sabanci University. Orta Mahalle, Tuzla 34956, Istanbul
kosara@sabanciuniv.edu

1Corresponding author.

ASME doi:10.1115/1.4036651 History: Received September 03, 2016; Revised March 05, 2017

Abstract

New requirements for heat exchangers offered pool boiling heat transfer on structured and coated surfaces as one of the promising methods for effective heat removal. In this study, pool boiling experiments were conducted on pHEMA coated surfaces to investigate the effect of surface orientation on bubble dynamics and nucleate boiling heat transfer. pHEMA (polyhydroxyethylmethacrylate) coatings with thicknesses of 50, 100 and 200 nm were deposited using the iCVD (initiated chemical deposition) method. De-ionized water was used as the working fluid. Experiments were performed on horizontal and inclined surfaces (inclination angles of 10° ,30°, 50° and 70°) under the constant heat flux boundary condition. Obtained results were compared to their plain surface counterparts, and heat transfer enhancements were observed. Accordingly, it was observed that the bubble departure phenomenon was affected by heat flux and wall superheat on bare silicon surfaces, while the supply path of vapor altered the bubble departure process on pHEMA coated surfaces. Furthermore; the surface orientation played a major role on bubble dynamics and could be considered as a mechanism for fast vapor removal from surfaces. Bubble coalescence and liquid replenishment on coated surfaces had a promising effect on heat transfer coefficient enhancement on coated surfaces. For horizontal surfaces, a maximum enhancement of 25% relative to the bare surface was achieved, while the maximum enhancement was 105% for the inclined coated surface under the optimum condition. iCVD was proven to be a practical method for coating surfaces for boiling heat transfer applications.

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