TY - JOUR
T1 - Film boiling heat transfer on a completely wettable surface with atmospheric saturated distilled water quenching
AU - Kang, Jun Young
AU - Kim, Seol Ha
AU - Jo, Hang Jin
AU - Park, Gunyeop
AU - Ahn, Ho Seon
AU - Moriyama, Kiyofumi
AU - Kim, Moo Hwan
AU - Park, Hyun Sun
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The goal of this study is to investigate film boiling heat transfer (FBHT) on a completely wettable surface (CWS) with atmospheric, saturated distilled water (Tsat ∼ 97°C). The CWS was fabricated using anodic oxidation of a zirconium rod, to achieve a contact angle of θ ∼ 0°with liquid-spreading and this was driven by capillary-wicking into the nano-scale, needle-shaped structures on the surface. To consider independently the effects of the maximum height εmax of the surface roughness, we investigated a roughed zirconium surface (RZS), which was modified by polishing with sandpaper. Quenching experiments were conducted to evaluate the FBHT; the heat transfer coefficient (hfilm) during FBHT, minimum heat flux (q″min) and minimum film boiling temperature (Tmin) were all larger with the CWS than with the bare zirconium surface (BZS) or on the RZS. Through high speed visualization, we observed that intermittent wetting during FBHT resulted in an unstable liquid-vapor interface in case of the CWS. Therefore, the remarkable ability of the CWS to supply liquid when in contact with the heat transfer surface resulted in clear enhancement of the FBHT performance (i.e., increases in hfilm, q″min and Tmin).
AB - The goal of this study is to investigate film boiling heat transfer (FBHT) on a completely wettable surface (CWS) with atmospheric, saturated distilled water (Tsat ∼ 97°C). The CWS was fabricated using anodic oxidation of a zirconium rod, to achieve a contact angle of θ ∼ 0°with liquid-spreading and this was driven by capillary-wicking into the nano-scale, needle-shaped structures on the surface. To consider independently the effects of the maximum height εmax of the surface roughness, we investigated a roughed zirconium surface (RZS), which was modified by polishing with sandpaper. Quenching experiments were conducted to evaluate the FBHT; the heat transfer coefficient (hfilm) during FBHT, minimum heat flux (q″min) and minimum film boiling temperature (Tmin) were all larger with the CWS than with the bare zirconium surface (BZS) or on the RZS. Through high speed visualization, we observed that intermittent wetting during FBHT resulted in an unstable liquid-vapor interface in case of the CWS. Therefore, the remarkable ability of the CWS to supply liquid when in contact with the heat transfer surface resulted in clear enhancement of the FBHT performance (i.e., increases in hfilm, q″min and Tmin).
KW - Completely wettable surface
KW - Film boiling heat transfer (FBHT)
KW - Heat transfer coefficient during FBHT
KW - Intermittent wetting during FBHT
KW - Minimum film boiling temperature
KW - Minimum heat flux
UR - http://www.scopus.com/inward/record.url?scp=84944348528&partnerID=8YFLogxK
U2 - 10.1016/j.ijheatmasstransfer.2015.09.049
DO - 10.1016/j.ijheatmasstransfer.2015.09.049
M3 - Article
AN - SCOPUS:84944348528
SN - 0017-9310
VL - 93
SP - 67
EP - 74
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
M1 - 12509
ER -