TY - JOUR
T1 - Numerical study of flow and thermal characteristics in titanium alloy milling with hybrid nanofluid minimum quantity lubrication and cryogenic nitrogen cooling
AU - Kim, Woo Yul
AU - Senguttuvan, Santhosh
AU - Kim, Seong Hoon
AU - Lee, Sang Won
AU - Kim, Sung Min
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/5
Y1 - 2021/5
N2 - The flow and heat transfer characteristics in titanium alloy (Ti-6Al-4V) milling with a hybrid nanofluid minimum quantity lubrication (nMQL) and cryogenic nitrogen lubrication/cooling method is numerically analyzed for two different cryogenic spraying conditions of N2 (sensible cooling) and LN2 (latent cooling), and three different nMQL nozzle spray angles of 0˚, 45˚, and 90˚. The volume of fluid (VOF) model is employed to track the interface between each fluid, which is air, N2, and LN2. The discrete phase model (DPM) is used to solve the trajectory and temperature of nMQL droplets. The heat generation occurred during the milling process, and the phase change of the liquid nitrogen is modeled using the user-defined functions (UDF) in ANSYS Fluent. The results show that the LN2 spraying condition provides extremely effective cooling of the Ti-6Al-4V workpiece and tungsten carbide (WC) tool in the Ti-6Al-4V milling process. However, increased nMQL droplets pass through the cutting zone under the N2 spraying condition, enhancing the lubrication. Moreover, the 0˚ nMQL spray angle is found to be best suited for improved cooling and lubrication performance under both the N2 and LN2 spraying conditions.
AB - The flow and heat transfer characteristics in titanium alloy (Ti-6Al-4V) milling with a hybrid nanofluid minimum quantity lubrication (nMQL) and cryogenic nitrogen lubrication/cooling method is numerically analyzed for two different cryogenic spraying conditions of N2 (sensible cooling) and LN2 (latent cooling), and three different nMQL nozzle spray angles of 0˚, 45˚, and 90˚. The volume of fluid (VOF) model is employed to track the interface between each fluid, which is air, N2, and LN2. The discrete phase model (DPM) is used to solve the trajectory and temperature of nMQL droplets. The heat generation occurred during the milling process, and the phase change of the liquid nitrogen is modeled using the user-defined functions (UDF) in ANSYS Fluent. The results show that the LN2 spraying condition provides extremely effective cooling of the Ti-6Al-4V workpiece and tungsten carbide (WC) tool in the Ti-6Al-4V milling process. However, increased nMQL droplets pass through the cutting zone under the N2 spraying condition, enhancing the lubrication. Moreover, the 0˚ nMQL spray angle is found to be best suited for improved cooling and lubrication performance under both the N2 and LN2 spraying conditions.
KW - discrete phase model
KW - phase change
KW - sliding mesh
KW - volume of fluid method
UR - https://www.scopus.com/pages/publications/85100538098
U2 - 10.1016/j.ijheatmasstransfer.2021.121005
DO - 10.1016/j.ijheatmasstransfer.2021.121005
M3 - Article
AN - SCOPUS:85100538098
SN - 0017-9310
VL - 170
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
M1 - 121005
ER -