TY - JOUR
T1 - Thermal performance analysis of a hybrid micro-channel, -pillar and -jet impingement heat sink
AU - Husain, Afzal
AU - Ariz, Mohd
AU - Al-Rawahi, Nabeel Z.H.
AU - Ansari, Mohd Z.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
PY - 2016/6/5
Y1 - 2016/6/5
N2 - The present study proposes a novel hybrid design of a heat sink based on micro-channel, -pillar and -jet impingement. A three-dimensional numerical model is constructed to investigate the thermal performance of the proposed design for steady state, incompressible and laminar flow. A constant heat flux was applied on one side of the substrate while on the other side micro-channels, -pillars and -jet impingements were arranged. The performance of the newly designed hybrid heat sink was compared with the basic designs of parallel flow micro-channels, micro-channels with micro-pillars, and micro-jet impingement heat sinks. The parametric analysis of the hybrid heat sink was performed by forming two dimensionless variables, i.e., ratios of standoff (distance of nozzle exit to impingement surface) to jet diameter and jet pitch to jet diameter. The performance of the hybrid heat sink was investigated in terms of heat transfer coefficient, Nusselt number, pressure-drop, overall thermal resistance and pumping power. The hybrid designs with low jet pitch to jet diameter ratios offered high heat transfer coefficient while high jet pitch to jet diameter ratios offered low pressure-drops. High heat transfer coefficients were observed for jet and pillar combinations and low thermal resistance and pumping power were observed for standoff to jet diameter ratio close to 2 and 3.
AB - The present study proposes a novel hybrid design of a heat sink based on micro-channel, -pillar and -jet impingement. A three-dimensional numerical model is constructed to investigate the thermal performance of the proposed design for steady state, incompressible and laminar flow. A constant heat flux was applied on one side of the substrate while on the other side micro-channels, -pillars and -jet impingements were arranged. The performance of the newly designed hybrid heat sink was compared with the basic designs of parallel flow micro-channels, micro-channels with micro-pillars, and micro-jet impingement heat sinks. The parametric analysis of the hybrid heat sink was performed by forming two dimensionless variables, i.e., ratios of standoff (distance of nozzle exit to impingement surface) to jet diameter and jet pitch to jet diameter. The performance of the hybrid heat sink was investigated in terms of heat transfer coefficient, Nusselt number, pressure-drop, overall thermal resistance and pumping power. The hybrid designs with low jet pitch to jet diameter ratios offered high heat transfer coefficient while high jet pitch to jet diameter ratios offered low pressure-drops. High heat transfer coefficients were observed for jet and pillar combinations and low thermal resistance and pumping power were observed for standoff to jet diameter ratio close to 2 and 3.
KW - Heat transfer coefficient
KW - Hybrid heat sink
KW - Micro-channels, -pillars and -jet impingements
KW - Nusselt number
KW - Pumping power
KW - Thermal resistance
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U2 - 10.1016/j.applthermaleng.2016.03.048
DO - 10.1016/j.applthermaleng.2016.03.048
M3 - Article
AN - SCOPUS:84963731884
SN - 1359-4311
VL - 102
SP - 989
EP - 1000
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -