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Droplet Impact Sub-cavity Histories ...

Hillen, Nicholas Lee.

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Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling./
Author:	Hillen, Nicholas Lee.
Description:	201 p.
Notes:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1524602
ISBN:	9781303557972

Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling.
Hillen, Nicholas Lee.

Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling. - 201 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (M.S.)--West Virginia University, 2013.

Spray cooling is a topic of current interest for its ability to uniformly remove high levels of waste heat from densely packed microelectronics. It has demonstrated the ability to achieve very high heat fluxes, up to 500 W/cm2 with water as the coolant, making it an attractive active thermal management tool.

ISBN: 9781303557972Subjects--Topical Terms:

783786
Engineering, Mechanical.

Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling.
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020 $a 9781303557972
035 $a (MiAaPQ)AAI1524602
035 $a AAI1524602
040 $a MiAaPQ $c MiAaPQ
100 1 $a Hillen, Nicholas Lee. $3 2096364
245 1 0 $a Droplet Impact Sub-cavity Histories and PDPA Spray Experiments for Spray Cooling Modeling.
300 $a 201 p.
500 $a Source: Masters Abstracts International, Volume: 52-03.
500 $a Adviser: John M. Kuhlman.
502 $a Thesis (M.S.)--West Virginia University, 2013.
520 $a Spray cooling is a topic of current interest for its ability to uniformly remove high levels of waste heat from densely packed microelectronics. It has demonstrated the ability to achieve very high heat fluxes, up to 500 W/cm2 with water as the coolant, making it an attractive active thermal management tool.
520 $a Full Computational Fluid Dynamic (CFD) simulations of spray cooling are infeasible due to the complexity of the spray (drops fluxes of 106 drops/cm2-sec) and heater surface physics requiring impractical resources. Thus a Monte-Carlo (MC) spray cooling simulation model based on empirical data is under development to serve as a cost effective design tool. The initial MC model shows promise, but it lacks additional physics necessary to predict accurate heat fluxes based on nozzle conditions and heated surface geometry.
520 $a This work reports spray and single drop experiments with the goal of computing the volume beneath a droplet impact cavity (the sub-cavity volume) created by a single impinging droplet on an initial liquid layer. A Phase Doppler Particle Analyzer (PDPA) was utilized to characterize a spray of interest in terms of integrated global Weber, Reynolds, and Froude numbers for varying flow conditions. Results showed that the spray droplet diameters decreased and velocities increased with increasing nozzle gage pressure. A relevant test plan for the single drop experiments has been created from the measured PDPA spray profiles combined with residual spray film thickness measurements from literature resulting in: 140≤We≤1,000, 1,200≤ Re≤3,300, and 0.2≤h0*≤1.0. Froude numbers were not able to be matched for the current single drop experiments (spray: 32,800≤Fr≤275,000).
520 $a Liquid film thicknesses under the cavity formed by a single droplet have been measured versus radius and time via a non-contact optical thickness sensor for the selected range of dimensionless numbers (We, Re, and h0*). Sub-cavity radius histories have also been analyzed utilizing high-speed imagery techniques to create the cavity thickness traverse profiles. Time dependent sub-cavity volumes have been computed by integrating these subcavity liquid film thicknesses versus radius at various times. It is found that higher We and lower h0* result in a more radially uniform sub-cavity surface contour versus time, except for thinner liquid film regions which are observed near the outer bottom cavity radius. The subcavity volume was found to be nearly constant for a majority of the cavity lifetime and increased with We and h0*. These results will be incorporated into the MC model to improve its predictive capability in future work.
520 $a In addition, splashed droplet diameters and velocities have been extracted from PDPA data for a spray impinging normal to a smooth surface. It was found that the splashed droplets had sizes which were similar to the impinging spray droplets, and had velocities that never exceeded 3 m/s. The splashed droplet results have a negligible contribution to cavity formations due to their low Weber number. This splashing data has been detailed for future implementation into the MC model in terms of mass conservation in the liquid film.
590 $a School code: 0256.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, General. $3 1020744
690 $a 0548
690 $a 0538
690 $a 0537
710 2 $a West Virginia University. $3 1017532
773 0 $t Masters Abstracts International $g 52-03(E).
790 $a 0256
791 $a M.S.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1524602