TY - JOUR
T1 - Numerical analysis of the heat transfer and fluid flow characteristics of a nanofluid-cooled micropin-fin heat sink using the Eulerian-Lagrangian approach
AU - Ambreen, Tehmina
AU - Saleem, Arslan
AU - Park, Cheol Woo
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - In the present study, the thermofluid characteristics of a water and nanofluid-cooled micropin-fin heat sink have been evaluated by implementing a two-phase Eulerian-Lagrangian model. The nanofluid consisted of an aqueous suspension of the spherical-shaped alumina nanoparticles with the particle volume fraction (φ) ranging from 0.25% to 1%. The analysis has been performed by considering a heat sink comprising the staggered arrangement of 72 micropin-fins of the circular cross-section without tip clearance. A constant heat flux of 300 kW/m 2 was subjected at the base of the heat sink, whilst the utilised pressure drop (∆P) across the heat sink was limited to ∆P<3000Pa. Heat transfer and fluid flow parameters were evaluated in terms of the local heat transfer coefficient, the enhancement ratio of the average convective heat transfer coefficient, thermal resistance and volume flow rate through the heat sink. Additionally, the temperature contours and flow streamlines across the heat sink elaborated the temperature distribution and flow attributes. Results indicated that under identical ∆P conditions, replacing water coolants with nanofluids optimised the thermal performance of the heat sink with a perceptible margin at the higher particle loadings. At the optimal pressure drop and particle concentration, nanoparticle dispersion into the hosting fluid demonstrated a maximum of 16% enhancement in the average heat transfer coefficient.
AB - In the present study, the thermofluid characteristics of a water and nanofluid-cooled micropin-fin heat sink have been evaluated by implementing a two-phase Eulerian-Lagrangian model. The nanofluid consisted of an aqueous suspension of the spherical-shaped alumina nanoparticles with the particle volume fraction (φ) ranging from 0.25% to 1%. The analysis has been performed by considering a heat sink comprising the staggered arrangement of 72 micropin-fins of the circular cross-section without tip clearance. A constant heat flux of 300 kW/m 2 was subjected at the base of the heat sink, whilst the utilised pressure drop (∆P) across the heat sink was limited to ∆P<3000Pa. Heat transfer and fluid flow parameters were evaluated in terms of the local heat transfer coefficient, the enhancement ratio of the average convective heat transfer coefficient, thermal resistance and volume flow rate through the heat sink. Additionally, the temperature contours and flow streamlines across the heat sink elaborated the temperature distribution and flow attributes. Results indicated that under identical ∆P conditions, replacing water coolants with nanofluids optimised the thermal performance of the heat sink with a perceptible margin at the higher particle loadings. At the optimal pressure drop and particle concentration, nanoparticle dispersion into the hosting fluid demonstrated a maximum of 16% enhancement in the average heat transfer coefficient.
KW - Alumina nanofluid
KW - Convective heat transfer
KW - Eulerian-Lagrangian model
KW - Micropin-fin heat sink
KW - Particle concentration
UR - http://www.scopus.com/inward/record.url?scp=85060336014&partnerID=8YFLogxK
U2 - 10.1016/j.powtec.2019.01.042
DO - 10.1016/j.powtec.2019.01.042
M3 - Article
AN - SCOPUS:85060336014
SN - 0032-5910
VL - 345
SP - 509
EP - 520
JO - Powder Technology
JF - Powder Technology
ER -