Testing Two High Heat Flux Liquid Nitrogen Jet Impingement Evaporative Coolers

2011 ◽  
Author(s):  
Ezra Takara ◽  
Ike Hsu ◽  
Bozhidar Evtimov
Keyword(s):  
Heat Flux ◽  
Liquid Nitrogen ◽  
Jet Impingement ◽  
High Heat ◽  
High Heat Flux

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.

High Heat Flux Cooling With Water Jet Impingement

Volume 1 ◽  
2004 ◽  
Author(s):  
I. Silverman ◽  
A. Nagler
Keyword(s):  
Heat Flux ◽  
Cooling System ◽  
Jet Impingement ◽  
High Heat ◽  
Electron Gun ◽  
Total Power ◽  
Liquid Gallium ◽  
High Heat Flux ◽  
Target Area ◽  
Average Heat

Accelerator targets, both for radioisotope production and for neutron sources generate thermal energy at very high density due to the absorption of the particles beam in the target material. Total power is in the order of 10–50 kW. Average heat fluxes are about 1 kW/cm2 and maximum values can exceed 5 kW/cm2. The design of these targets requires efficient heat removal techniques in order to preserve the integrity of the target. Experimental cooling loops based on water and liquid gallium jet impingement have been designed in order to evaluate the actual potential of jet impingement for high heat flux cooling. The water cooling system is already operational and initial results have demonstrated a cooling capacity of 5 kW with average heat flux of 0.5 kW/cm2 and a maximum of about 1 kW/cm2 with a total target area of 10 cm2. In order to test the system at higher power level we build an electron gun heat source that is designed to provide up to 20 kW heating power.

High heat-flux accelerator targets: Cooling with liquid metal jet impingement

2006 ◽  
Vol 49 (17-18) ◽  
pp. 2782-2792 ◽  
Author(s):  
I. Silverman ◽  
A.L. Yarin ◽  
S.N. Reznik ◽  
A. Arenshtam ◽  
D. Kijet ◽  
...  
Keyword(s):  
Heat Flux ◽  
Liquid Metal ◽  
Jet Impingement ◽  
High Heat ◽  
High Heat Flux ◽  
Metal Jet
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