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Thermal Convection in Vertically Suspended Soap Films

Zhang, Jie (2005) Thermal Convection in Vertically Suspended Soap Films. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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In normal fluids, a temperature difference can create a density difference. In the presence of the gravitational field, denser fluid will fall and lighter fluid will rise, causing fluid motion known as thermal convection. This type of convection can occur on different scales, from a single growing crystal to mantle movement inside the earth. Although many experiments have been conducted in unstably stratified fluids, there have been few laboratory experiments studying convective turbulence in stably stratified fluids, which is more common in nature. Here I present a two-dimensional (2D) convection in a stably stratified vertical soap film. It was found that the interaction between the gravitational potential energy, due to the 2D density fluctuation, and the kinetic energy is important. This interplay between the two energy sources manifests itself in the statistical properties of velocity and 2D density fluctuations in the system. Our experimental findings shed new lights to a turbulent system that strongly couples to a non-passive field.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Zhang, Jiejizst11@pitt.eduJIZST11
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairWu, XiaoLunxlwu@pitt.eduXLWU
Committee MemberLevy, Jeremyjlevy@pitt.eduJLEVY
Committee MemberCoalson, Robertrob@ringo.chem.pitt.eduCOALSON
Committee MemberGoldburg, Waltergoldburg@pitt.eduGOLDBURG
Committee MemberGoldschmidt, Yadin Yyadin@pitt.eduYADIN
Date: 6 June 2005
Date Type: Completion
Defense Date: 29 March 2005
Approval Date: 6 June 2005
Submission Date: 21 April 2005
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: convection; skewness; soap film; thickness fluctuation; velocity intermittency
Other ID:, etd-04212005-115428
Date Deposited: 10 Nov 2011 19:39
Last Modified: 15 Nov 2016 13:41


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