{"id":31,"date":"2018-09-16T14:13:09","date_gmt":"2018-09-16T21:13:09","guid":{"rendered":"https:\/\/blogs.ubc.ca\/mzare\/?page_id=31"},"modified":"2022-06-28T20:05:27","modified_gmt":"2022-06-29T03:05:27","slug":"research","status":"publish","type":"page","link":"https:\/\/blogs.ubc.ca\/mzare\/research\/","title":{"rendered":"Research"},"content":{"rendered":"

Mechanics and rheology of complex fluids<\/strong><\/em><\/p>\n

My research interests lie in fluid mechanics, with a focus on experimental studies of complex fluids in particular viscoplastic fluids (VPFs). A significant number of fluids that are categorized as VPFs: used in our daily life such as toothpaste, hand sanitizers, and peanut butter; in geophysical and industrial settings, such as magma, cement slurry, tailing fluids, and drilling mud. Studying the flow of complex fluids and non-colloidal suspensions have been the focus of my doctoral and current research activities.<\/p>\n

As the manager of the complex fluids lab at UBC, I also organize training sessions and advise students in performing rheological tests and using rheo-imaging and rheo-scattering techniques.<\/p>\n

My research studies are described as follows:<\/p>\n

(I) Mechanics of bubbles rise in complex fluids. <\/em><\/em><\/p>\n

The focus of this part of my research is on restoring polluted lakes. It is in collaboration\u00a0with Professor Greg Lawrence at the Department of Civil Engineering, UBC.<\/p>\n

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Spatiotemporal images of first bubble propagation through three layers of Densified Carbopol (DC), glycerol, and Carbopol. Pure glycerol is used in cases (a)-(e). Glycerol concentration in case (f) is 80%. The concentration of Carbopol solutions used in DC and C layers are: a) DC=0.15%, C=0.06%; b) DC=0.15%, C=0.1%; c) DC=0.15%, C=0.2%; d) DC=0.18%, C=0.15%; e) DC=0.18%, C=0.1%; f) DC=0.15%, C=0.1%. As DC concentration increases, bubbles tend to have a larger volume. As glycerol concentration decreases, bubbles tend to have a less spherical shape. The DC layer in case (e) was dyed to investigate whether bubbles entrain the DC fluid into the glycerol layer.<\/p>\n

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The flow and trajectory of a rising bubble initially positioned within a yield stress fluid at a horizontal distance\u00a0to a Newtonian layer. The panel on the left shows the numerical results and the experimental results are shown in the panel on the right.<\/p>\n

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The flow and trajectory of a bubble rising bubble in a viscous layer crossing a yield stress fluid at \u00a0 $\\theta$<\/span>= 72.5 . The panel on the left shows the numerical results and the experimental results are shown in the panel on the right.<\/p>\n

(II) Multi-layer flows with yield stress fluids,\u00a0<\/em><\/p>\n

Evaluating the interface position and the shape of the interface between the fluids by solving the nonlinear wave equation obtained from the lubrication model:<\/p>\n

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Interface propagation obtained from two-layer model: (a) Frontal shock; (b) contact shock (spike). M. Zare, et al., J. non-Newton. Fluid Mech, (2017), https:\/\/doi.org\/10.1016\/j.jnnfm.2017.06.002.<\/p><\/div>\n

Computational results obtained for the density unstable displacement of a yield stress fluid from a channel:<\/p>\n

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Panorama of flow types observed for Bingham (B)=1, and viscosity ratio (m)=3. Markers indicate data position in (Re, Re\/Fr^2) plane with symbols indicating the corresponding flow regime [M. Zare, and I.A. Frigaard. J. non-Newton. Fluid Mech, (2018) https:\/\/doi.org\/10.1016\/j.jnnfm.2018.07.007].<\/p><\/div>\n

(III) Onset of invasion of viscous fluids to a yield stress fluid column and their propagation through the gelled column,\u00a0<\/em><\/p>\n

 <\/p>\n

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This figure shows the invasion process of air, rhodorsil oil, glycein, and water respectively from top to bottom to our model yield stress fluid, i.e carbopol [M. Zare, I. A. Frigaard, Phys. Fluids, https:\/\/doi.org\/10.1063\/1.5024718].<\/p><\/div>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Mechanics and rheology of complex fluids My research interests lie in fluid mechanics, with a focus on experimental studies of complex fluids in particular viscoplastic fluids (VPFs). A significant number of fluids that are categorized as VPFs: used in our daily life such as toothpaste, hand sanitizers, and peanut butter; in geophysical and industrial settings, […]<\/p>\n","protected":false},"author":54983,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-31","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/pages\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/users\/54983"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/comments?post=31"}],"version-history":[{"count":47,"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/pages\/31\/revisions"}],"predecessor-version":[{"id":488,"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/pages\/31\/revisions\/488"}],"wp:attachment":[{"href":"https:\/\/blogs.ubc.ca\/mzare\/wp-json\/wp\/v2\/media?parent=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}