...Myung Ki Sung; Issam Mudawar This study examines the cooling performance of two hybrid cooling schemes that capitalize on the merits of both microchannel flow and jet impingement to achieve the high cooling fluxes and uniform temperatures demanded by advanced defense electronics. The jets supply...

...Y. C. Lee; C. J. Fang; M. C. Wu; C. H. Peng; Y. H. Hung An effective method for performing the thermal optimization of stationary and rotating multichip module (MCM) disks with an unconfined round-jet impingement under space limitation constraint has been successfully developed. The design...

...C. J. Fang; M. C. Wu; Y. M. Kuo; C. Y. Lee; C. H. Peng; Y. H. Hung A series of experimental investigations on the studies related to fluid flow and transient mixed convection from a horizontally unconfined stationary or rotating ceramic-based multichip module (MCM) disk with unconfined jet...

...D. H. Lee; Y. S. Chung; P. M. Ligrani Fluid flow and heat transfer characteristics on and around a central pedestal and a secondary pedestal, mounted on a flat surface with an impinging jet, are investigated. Surface Nusselt numbers, pressure coefficients (in the form of normalized wall static...

...Yong Wang; Guang Yuan; Yong-Kyu Yoon; Mark G. Allen; Sue Ann Bidstrup The active cooling substrate in this study is a microelectromechanical system device that implements the synthetic jet concept into a printed wiring board (PWB) to enhance thermal management. Synthetic jets are oscillatory jets...

...Steven W. Tillery; Samuel N. Heffington; Marc K. Smith; Ari Glezer In this paper we describe a new two-phase cooling cell based on channel boiling and a vibration-induced liquid jet whose collective purpose is to delay the onset of critical heat flux by forcibly dislodging the small vapor bubbles...

.... The objective of this study is to investigate if targeted cooling systems, i.e., an impinging jet in combination with a low velocity channel flow, can improve the thermal performance of the system. The steady-state three-dimensional (3-D) model is developed with the Reynolds-Stress-Model (RSM) as a turbulence...

...Eric Sansoucy; Patrick H. Oosthuizen; Gamal Refai-Ahmed An experimental study was conducted to investigate the heat transfer from a parallel flat plate heat sink under a turbulent impinging air jet. A horizontal nozzle plate confined the target surface. The jet was discharged from a sharp-edged...

...Johnny S. Issa; Alfonso Ortega The flow behavior and heat transfer due to free air jet impingement on pin fin heat sinks was experimentally studied. Flow velocities and tip clearance ratios were varied from 2 to 20 m ∕ s and 0 to 1, respectively. The stagnation pressure recovered at the center...

...Ta-Wei Lin; Ming-Chang Wu; Li-Kang Liu; Chun-Jen Fang; Ying-Huei Hung A series of experimental investigations on the studies related to transient- and steady-state cooling performance from the horizontally heated heat sinks with a confined slot jet impingement have been conducted. The relevant...

...Y. S. Chung; D. H. Lee; P. M. Ligrani Surface Nusselt numbers, pressure coefficients, and flow visualizations are presented which are measured as a turbulent jet, with a fully developed velocity profile, impinges on the cylindrical pedestal and on the surrounding flat surface. Thermochromic liquid...

...Jivtesh Garg; Mehmet Arik; Stanton Weaver; Todd Wetzel; Seyed Saddoughi Microfluid devices are conventionally used for boundary layer control in many aerospace applications. Synthetic jets are intense small-scale turbulent jets formed from periodic entrainment and expulsion of the fluid in which...

...Siddharth Bhopte; Musa S. Alshuqairi; Dereje Agonafer, Fellow ASME; Gamal Refai-Ahmed, Fellow ASME The current numerical investigation will examine the effect of an impinging mixed convection air jet on the heat transfer rate of a parallel flat plate heat sink. A three-dimensional numerical model...

... chips and modules in air-cooled environments and applies to workstations or mainframes. In the study, a rectangular jet impinges on a set of parallel fins and then turns into cross flow. The effects of the fin thickness, gap nozzle width and fin shape on the heat transfer and pressure drop...

...Raghav Mahalingam; Ari Glezer The design and thermal performance of a synthetic-air-jet-based heat sink for high-power dissipation electronics is discussed. Each fin of a plate-fin heat sink is straddled by a pair of two-dimensional synthetic jets, thereby creating a jet ejector system...

...Sreekant V. J. Narumanchi; Cristina H. Amon, Fellow ASME; Jayathi Y. Murthy, Mem. ASME In this study, numerical investigations are performed to examine the influence of unsteady submerged dielectric liquid (HFE-8401HT) jets impinging on electronic chip surfaces. The problem considered here involves...

...Suresh V. Garimella; Vincent P. Schroeder Heat transfer from a discrete heat source to multiple, normally impinging, confined air jets was experimentally investigated. The jets issued from short, square-edged orifices with still-developing velocity profiles on to a foil heat source which produced...

..., was found considerably lower than those predicted by the existing correlations. It is pointed out that the thermal mass of the test heater could be an important factor for the CHF. The heat transfer behavior of other strips showed channel-flow or jet-impingement mode depending on the strip location...

.... Enhancement factors were computed with the heat sink in suction flow, relative to a bare surface, and were in the range of 8.3 to 17.7, with the largest value being obtained for the nine-nozzle array. Results from the present study on air jet suction are compared with previous experiments with air jet...