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Experimental Investigation of Cooling Surfaces with Electrospray Using a Porous Nozzle

Ebrahimi, Fariba | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57969 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Morad, Mohammad Reza
  7. Abstract:
  8. Electrospray, as a novel and efficient method in jet production, utilizes a combination of hydrodynamic and electrostatic forces. In electrohydrodynamic systems, by controlling effective parameters, it is possible to achieve a wide range of fluid flow regimes. Among these, the stable cone-jet mode has attracted special attention from researchers due to its stability and controllability characteristics. The unique features of this mode include uniformity in droplet size resulting from jet breakup (which is effective in reducing temperature gradients on hot surfaces), the ability to control fluid flow characteristics through adjustable parameters such as electrical voltage, and spray production to exploit the advantages of two-phase heat transfer. These characteristics have created significant potential for application in hot surface cooling. It is clear that thermal management in high-power-density electronic and electrical units in advanced industries drives our need to study and investigate hot surface cooling in a cost-effective manner. In this research, we experimentally investigate surface cooling and present our results by carefully monitoring the nozzle's effect on stable cone-jet mode formation. This study can be an effective step toward developing novel thermal management methods in high-power-density systems. In the first step of this research, electrohydrodynamic modes, with emphasis on the stable cone-jet mode, have been thoroughly examined from various aspects. Initially, the sensitivity of cooling parameters to factors affecting the electrohydrodynamic system has been measured, and to improve cooling efficiency, we will use a nozzle with specific characteristics that enables access to higher flow rates by increasing surface tension forces. Finally, based on the experimental results, the thermal behavior of the surface in the electrohydrodynamic system will be analyzed
  9. Keywords:
  10. Electrohydrodynamic ; Electrospray ; Cone-Jet ; Porous Nozzle ; Flow Modes ; Heat Cooling

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