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COUPLED DYNAMICS OF HEAT TRANSFER AND FLUID FLOW IN SHEAR RHEOMETRY

Sridharan, Harini
http://orcid.org/0000-0002-1061-5207
http://rave.ohiolink.edu/etdc/view?acc_num=akron1597346164780318

Abstract Details

2020, Master of Science, University of Akron, Polymer Engineering.
Heat is a ubiquitous phenomenon and its spatial flow has wide reaching impact that spans industry, physiology and even meteorology through examples such as materials processing, thermotaxis and weather patterns. In fluids, spatial heat flow – temperature difference over a characteristic length scale – produces gradients in density and viscosity to generate convective currents which assuredly affects rheological properties and dynamics. The coupled effects between fluid flow and heat flow are phenomenologically explored. To achieve this, a custom-built apparatus capable of introducing, sustaining and measuring heat flux orthogonal to fluid flow was integrated into a stress-controlled rheometer to investigate the impact of steady state temperature gradients on rheological characteristics under steady shear. The novelty of this system is the capacity to independently control temperature of each rheometer plate (i.e. test surface) to establish discreet temperature gradients in the range of -16 K/mm to 30 K/mm, which also gives a window to any potential gravitational effects. Glycerol is used as a model Newtonian fluid to validate the system. Coupled dynamics is scaled by the Brinkman number and Richardson number and is found to have a linear relationship for glycerol. To expand on this knowledge, preliminary data on a more complex (non-Newtonian) system with relevance to heat transfer applications is presented. The rheological and heat flow data was presented using this approach for nanofluids of two weight fractions of Carbon Nanotubes (CNT) in glycerol in order to further understand the implications and opportunities that interrelationships between heat and fluid flow may present in a more complex system.
Ruel McKenzie, (Advisor)
Kevin Cavicchi (Committee Chair)
Sadhan Jana (Committee Member)
66 p.
Engineering; Fluid Dynamics
Heat Transfer; Rheology; Shear Rheometry; Fluid Flow; Newtonian Fluid; non-Newtonian Fluid; Carbon Nanotube; Glycerol; Nanofluid; Temperature Gradient

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Citations

  • Sridharan, H. (2020). COUPLED DYNAMICS OF HEAT TRANSFER AND FLUID FLOW IN SHEAR RHEOMETRY [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1597346164780318

    APA Style (7th edition)

  • Sridharan, Harini. COUPLED DYNAMICS OF HEAT TRANSFER AND FLUID FLOW IN SHEAR RHEOMETRY. 2020. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1597346164780318.

    MLA Style (8th edition)

  • Sridharan, Harini. "COUPLED DYNAMICS OF HEAT TRANSFER AND FLUID FLOW IN SHEAR RHEOMETRY." Master's thesis, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1597346164780318

    Chicago Manual of Style (17th edition)

akron1597346164780318
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This open access ETD is published by University of Akron and OhioLINK.