scholarly journals Liquid jet impingement cooling with diamond substrates for extremely high heat flux applications

1993 ◽  
Author(s):  
John H. Lienhard V ◽  
Ali M. Khounsary
Keyword(s):  
Heat Flux ◽  
Jet Impingement ◽  
High Heat ◽  
Liquid Jet ◽  
High Heat Flux ◽  
Impingement Cooling

Heat Transfer by a Rotating Liquid Jet Impingement Cooling System

2018 ◽  
Author(s):  
Qi Lu ◽  
Siva Parameswaran ◽  
Beibei Ren
Keyword(s):  
Heat Flux ◽  
Cfd Simulation ◽  
Cooling System ◽  
Automatic Transmission ◽  
Jet Impingement ◽  
High Heat ◽  
Liquid Jet ◽  
High Heat Flux ◽  
Impingement Cooling ◽  
Commercial Code

The circular, liquid jet impingement provides a convenient way of cooling surfaces. To effectively cool the devices inside the electric vehicle, a rotating jet impingement cooling system is designed to evaluate the potential of the jet impingement for high heat flux removal. The liquid used for jet impingement is automatic transmission fluid. The jet impingement system consists of a rotating pipe with two nozzles and a cylindrical ring which is attached to the heat source. To reduce the computational loads, first, the CFD simulation for a laminar flow inside the pipe is carried out to estimate the flow velocities at the nozzle exits. Then, the rotating jet impingement cooling of a cylinder with a uniform surface temperature is investigated numerically for stable, unsubmerged, uniform velocity, single phase laminar jets. The numerical simulation using the commercial code is performed to determine the heat flux removal performance over the cylindrical surface. The numerical results are compared with the empirical formula and experimental measurements from the literature. Furthermore, the effects of the Reynolds number and pipe rotation on the jet impingement cooling performance are also investigated.

Novel PCM and Jet Impingement Based Cooling Scheme for High Density Transient Heat Loads

2010 ◽  
Author(s):  
Pritish R. Parida ◽  
Srinath V. Ekkad ◽  
Khai Ngo
Keyword(s):  
Phase Change Materials ◽  
High Efficiency ◽  
Cooling System ◽  
Jet Impingement ◽  
High Heat ◽  
High Heat Flux ◽  
Impingement Cooling ◽  
Small Areas ◽  
High Heat Transfer ◽  
Heat Loads

Breakthroughs in the recent cutting-edge technologies have become increasingly dependent on the ability to safely dissipate large amount of heat from small areas. Improvements in cooling techniques are therefore required to avoid unacceptable temperature rise and at the same time maintain high efficiency. Jet impingement is one such cooling scheme which has been widely used to dissipate transient and steady concentrated heat loads. With constantly increasing transient cooling needs, conventional pin-fin cooling and conventional jet impingement cooling are not meeting the requirements. Considerable improvements are therefore required to meet such stringent requirements without any significant changes in the cooling system. A combined cooling scheme based on jet impingement and phase change materials (PCMs) is presented as one such alternative to existing cooling systems. A high heat storage capability of PCMs in combination with a high heat transfer rates from impingement cooling can help overcome the existing heat distribution and transient cooling problems in high heat flux dissipating devices. Preliminary conjugate CFD simulations show promising results. Additionally, experimental validation of the simulation predictions has also been performed. A reasonably good agreement was found between the predictions and experiments.

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