Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Heat Transfer and Flow Analysis of a Novel Low Flow Piezoelectric Air Pump

Eastman, Andrew S (2013) Heat Transfer and Flow Analysis of a Novel Low Flow Piezoelectric Air Pump. Master's Thesis, University of Pittsburgh. (Unpublished)

Primary Text

Download (4MB) | Preview


With the propagation of ever faster and more powerful electronics, the need for active, low power cooling is becoming increasingly apparent. In particular, applications which have traditionally relied only on natural convection will soon require an active cooling solution due to continually rising heat loads. A promising solution lies in utilizing piezoelectric materials via fans or pumps. Examples of such devices include synthetic jets and piezoelectric pumps, both of which rely on an oscillating diaphragm to induce flow. The device investigated in this thesis is able to generate flow rates up to 1 L/min and overcome pressures of over 2 kPa. The focus is to experimentally characterize the cooling potential of a piezoelectric-based air pump oriented normal to a heated surface, an environment similar to jet impingement. Experimental characterizations were made through the use of a thin film heater which provided a constant heat flux while an infrared camera was used to capture the resulting temperature field of the heated surface. Full-field data of the convection coefficient was analyzed as a function of vibration amplitude of the piezoelectric diaphragm and distance from the nozzle to the heated target. The maximum heat transfer coefficient was found to always be at the stagnation point regardless of vibration amplitude or distance to the target. Correlations have been developed which account for both variables considered and can be used to predict the performance of future designs which rely on the same physical characteristics. Further, because of the piezoelectric blower’s ability to overcome large pressure drops, a theoretical analysis was conducted to assess the viability of using them in oscillating flow cooling. It was found to be a reasonable driver of reciprocating flow that can keep fluid temperature change low. Additionally it was found that reciprocating flow allows for a more uniform temperature distribution over a heated surface.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Eastman, Andrew Sase8@pitt.eduASE8
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorKimber, Mark Lmlk53@pitt.eduMLK53
Committee MemberSchaefer, Laura Alas149@pitt.eduLAS149
Committee MemberJana,
Date: 27 June 2013
Date Type: Publication
Defense Date: 27 March 2013
Approval Date: 27 June 2013
Submission Date: 4 April 2013
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 88
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Mechanical Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: piezoelectric, impinging jets, heat transfer, low Reynolds number flow
Date Deposited: 27 Jun 2013 16:14
Last Modified: 15 Nov 2016 14:11


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item