TY - JOUR
T1 - Behavior of small droplet impinging on a hot surface
AU - Fukuda, Shinya
AU - Kohno, Masamichi
AU - Tagashira, Keisuke
AU - Ishihara, Nobuya
AU - Hidaka, Sumitomo
AU - Takata, Yasuyuki
N1 - Funding Information:
This study was supported by a Grant-in-Aid for Scientific Research, (A) 21246036, from MEXT.
PY - 2014/1/22
Y1 - 2014/1/22
N2 - The effects of droplet diameter, surface roughness, and impinging velocity on the behavior of a droplet impinging on a hot surface were studied. The surface samples used in the experiment were cylinder blocks of stainless steel having four different degrees of roughness: Ra 0.04, Ra 0.2, Ra 3, and Ra 10. The diameter and impinging velocity were controlled independently using a microjet dispenser, and their values were in the ranges of 300-700 μm and 1.0-4.0 m/s, respectively. The contact time was found to increase with an increase in the surface roughness and was of the order of the self-oscillation of the water droplet. The maximum spread of the droplet decreased with increasing impinging velocity. A cooling curve was obtained for surface temperatures ranging from 500°C to 100°C, and the cooling time was found to decrease with an increase in the surface roughness of stainless steel. Moreover, the cooling effectiveness of each droplet increased with an increase in the surface roughness, a decrease in the droplet diameter, and an increase in the impinging velocity.
AB - The effects of droplet diameter, surface roughness, and impinging velocity on the behavior of a droplet impinging on a hot surface were studied. The surface samples used in the experiment were cylinder blocks of stainless steel having four different degrees of roughness: Ra 0.04, Ra 0.2, Ra 3, and Ra 10. The diameter and impinging velocity were controlled independently using a microjet dispenser, and their values were in the ranges of 300-700 μm and 1.0-4.0 m/s, respectively. The contact time was found to increase with an increase in the surface roughness and was of the order of the self-oscillation of the water droplet. The maximum spread of the droplet decreased with increasing impinging velocity. A cooling curve was obtained for surface temperatures ranging from 500°C to 100°C, and the cooling time was found to decrease with an increase in the surface roughness of stainless steel. Moreover, the cooling effectiveness of each droplet increased with an increase in the surface roughness, a decrease in the droplet diameter, and an increase in the impinging velocity.
UR - http://www.scopus.com/inward/record.url?scp=84884640028&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884640028&partnerID=8YFLogxK
U2 - 10.1080/01457632.2013.812496
DO - 10.1080/01457632.2013.812496
M3 - Article
AN - SCOPUS:84884640028
SN - 0145-7632
VL - 35
SP - 204
EP - 211
JO - Heat Transfer Engineering
JF - Heat Transfer Engineering
IS - 2
ER -