ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-472-4
ISBN Online: 978-1-56700-471-7
3rd Thermal and Fluids Engineering Conference (TFEC)
TURBULENT HEAT TRANSFER IN A TWO-PHASE CUBICAL HEAT SINK
要約
This paper presents a new design for heat sinks. The idea is to have a heat sink constructed from a cubical cavity
partially filled with a liquid coolant. The top surface of the cavity is attached to a heat source, while the lateral
surfaces are maintained at low temperature. The coolant is a mixture of water and air. One vertical wall of the
cavity moves at constant speed, providing upward motion to the coolant. As a result, a turbulent two-phase flow
is established that extracts heat from the heat source and rejects it through the lateral walls of the heat sink. The
turbulent flow and heat transfer are modeled using Large Eddy Simulation (LES), and Volume-Of-Fluid (VOF)
is employed for interface tracking. The computations are performed using OpenFOAM as a base solver on
computer clusters using parallel computing. Computations reveal complex flow and thermal fields. The results
presented in this paper include instantaneous flow and thermal fields and heat rate for heat sinks for different
amounts of coolant. It is shown that heat transfer is enhanced up to 33% when the total volume of water is 25%
of the cavity volume. It is also found that when volume of water exceeds 33%, the enhancement either
diminishes or even suppresses heat transfer by 10%.