Optimization of synthetic jet cooling for microelectronics applications [VCSEL array example]

Pool boiling of Novec 7300 and DI water on nano-textured heater covered with supersonically-blown or electrospun polymer nanofibers

“…For smaller transistors, densely crowded in integrated circuits, thermal management becomes critical to avoid thermal failure due to differential thermal expansion of components and extend their operational lifetime [1,2]. Several approaches to cooling microelectronics were explored in the past, such as single-phase liquid cooling [3][4][5], flow boiling [6,7], jet impingement cooling [8][9][10], spray cooling [11], heat pipes [12], liquid metal cooling [13,14], indirect cooling with phase change materials [15], and pool boiling [16,17]. Pool boiling is one of the most promising methods of thermal management problem, which stems from high latent heat of evaporation of liquids.…”

High-frequency translational agitation with micro pin-fin surfaces for enhancing heat transfer of forced convection

“…Consisting of a drive, a diaphragm, a cavity and an orifice, they have gained much attention, recently, for localized cooling purposes. Beratlis and Smith [14] performed a numerical study to optimize a synthetic jet for cooling vertical cavity surfaces of a laser array.…”

“…where V in , ω, A, d h , d b and ν are the channel inlet velocity, frequency of the agitator, maximum mean-to-peak displacement, hydraulic diameters of the channel with blade, hydraulic diameter of the blade, and kinematic viscosity, respectively. The hydraulic diameter of the blade is: (14) where A b and P b are the area and perimeter of the blade plate, respectively. Similarly, the hydraulic diameter of the channel is defined as:…”

Heat transfer and flow characteristics of a pair of adjacent impinging synthetic jets

“…The oscillatory flow is typically driven by an oscillating diaphragm or membrane inside a cavity which periodically entrains and expels ambient fluid through an orifice to form a train of vortices and hence a time-averaged jet. Round orifices have been shown to form a train of vortex rings Pavlova and Amitay, 2006;Persoons et al, 2011;Shuster and Smith, 2007;Smith and Glezer, 2001;Valiorgue et al, 2009) whereas slot orifices form counter-rotating vortex pairs (Beratlis and Smith, 2003;Glezer and Amitay, 2002;Smith and Glezer, 2005). For an orifice diameter or slot width, D, the Reynolds number, Re = qU 0 D/l, and stroke length, L 0 , govern the flow field of a free synthetic jet.…”