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Главная Архив Thermal Letter Оргкомитет Будущие конференции AIHTC
International Heat Transfer Conference 15

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

Experimental Study on Heat Transfer Characteristics of High-Velocity Circular Jet Impingement Boiling on the Nano-characteristic Stagnation Zone

Yuanyang Li
Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China

Yanjun Chen
Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China

Zhenhua Liu
Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China

DOI: 10.1615/IHTC15.tps.009060
pages 9037-9051


Ключевые слова: Two-phase/Multiphase flow, Boiling and evaporation, jet, heat transfer characteristics, solid-liquid contact angle, nano-characteristic surface

Аннотация

The jet impingement boiling is the most effective heat transfer method among all the steady-state heat transfer forms. So far, various researches on the jet impingement boiling still lack experimental data under high impact velocity and special heated surface topography. Due to this reason, the present experimental study investigates the heat transfer characteristics of high-velocity circular jet impingement boiling on the nano-characteristic stagnation zone with different wettability. The surface wettability is varied to hydrophilic or hydrophobic nano-characteristic surfaces by modifying surface topography and chemistry. The effects of impact velocity, subcooling and solid-liquid contact angle (CA) on the onset of nucleate boiling (ONB), nucleate boiling heat transfer coefficient (HTC) are studied experimentally. It is found that their effects on the ONB are respectively independent. Wherein, the impact velocity and the subcooling are respectively in positive relationship with the wall superheat corresponding to the ONB point, while CA is in linear inverse relationship with it. Comprehensive effects of impact velocity and CA on the nucleate boiling HTC are also obtained. The proportion of nucleate boiling HTC after the ONB point gets more significant with increasing wall superheat. The HTC will increase with the impact velocity and CA. Some correlations are proposed for predicting the various effects on the jet boiling heat transfer characteristics. The comparison results indicate the predicted value agrees well with the experimental data.

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