Researcher:
Mustafa, Adil

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PhD Student

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Adil

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Mustafa

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Mustafa, Adil

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2016 - 20202

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Researcher Of Publications: search.filters.isAuthorOfPublication.07dfda04-c1d6-442a-a601-cfdab6e8508c

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    A micropillar-based microfluidic viscometer for newtonian and non-newtonian fluids
    (Elsevier, 2020) Tanyeri, Melikhan; Erten, Ahmet; Department of Physics; N/A; N/A; N/A; N/A; Kiraz, Alper; Yalçın, Özlem; Mustafa, Adil; Aksu, Ali Cenk; Eser, Ayşenur; Faculty Member; Faculty Member; PHD Student; PHD Student; Master Student; Department of Physics; College of Sciences; School of Medicine; Graduate School of Sciences and Engineering; School of Medicine; Graduate School of Sciences and Engineering; 22542; 218440; N/A; N/A; N/A
    In this study, a novel viscosity measurement technique based on measuring the deflection of flexible (poly) dimethylsiloxane (PDMS) micropillars is presented. The experimental results show a nonlinear relationship between fluid viscosity and the deflection of micropillars due to viscoelastic properties of PDMS. A calibration curve, demonstrating this nonlinear relationship, is generated, and used to determine the viscosity of an unknown fluid. Using our method, viscosity measurements for Newtonian fluids (glycerol/water solutions) can be performed within 2-100 cP at shear rates gamma = 60.5-398.4 s(-1). We also measured viscosity of human whole blood samples (non-Newtonian fluid) yielding 2.7-5.1 cP at shear rates gamma = 120-345.1 s(-1), which compares well with measurements using conventional rotational vis-cometers (3.6-5.7 cP). With a sensitivity better than 0.5 cP, this method has the potential to be used as a portable microfluidic viscometer for real-time rheological studies. (C) 2020 Elsevier B.V. All rights reserved.
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    Enhanced dissolution of liquid microdroplets in the extensional creeping flow of a hydrodynamic trap
    (Amer Chemical Soc, 2016) Tanyeri, Melikhan; N/A; Department of Physics; N/A; N/A; N/A; N/A; N/A; Department of Mechanical Engineering; Department of Physics; Mustafa, Adil; Erten, Ahmet Can; Ayaz, Rana Muhammed Armaghan; Kayıllıoğlu, Oğuz; Eser, Ayşenur; Eryürek, Mustafa; Irfan, Muhammad; Muradoğlu, Metin; Kiraz, Alper; PhD Student; Teaching Faculty; PhD Student; PhD Student; Master Student; PhD Student; PhD Student; Faculty Member; Faculty Member; Department of Mechanical Engineering; Department of Physics; Graduate School of Sciences and Engineering; College of Sciences; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Sciences; N/A; 233923; N/A; N/A; N/A; N/A; N/A; 46561; 22542
    A novel noncontact technique based on hydrodynamic trapping is presented to study the dissolution of freely suspended liquid microdroplets into a second immiscible phase in a simple extensional creeping flow. Benzyl benzoate (BB) and n-decanol microdroplets are individually trapped at the stagnation point of a planar extensional flow, and dissolution of single microdroplets into an aqueous solution containing surfactant is characterized at different flow rates. The experimental dissolution curves are compared to two models: (i) the Epstein-Plesset (EP) model which considers only diffusive mass transfer, and (ii) the Zhang-Yang-Mao (ZYM) model which considers both diffusive and convective mass transfer in the presence of extensional creeping flow. The EP model significantly underpredicts the experimentally determined dissolution rates for all experiments. In contrast, very good agreement is observed between the experimental dissolution curves and the ZYM model when the saturation concentration of the microdroplet liquid (c(s)) is used as the only fitting parameter. Experiments with BB microdroplets at low surfactant concentration (10 mu M) reveal c(s) values very similar to that reported in the literature. In contrast, experiments with BB and n-decanol microdroplets at 10 mM surfactant concentration, higher than the critical micelle concentration (CMC) of 5 mM, show further enhancements in microdroplet dissolution rates due to micellar solubilization. The presented method accurately tests the dissolution of single microdroplets into a second immiscible phase in extensional creeping flow and has potential for applications such as separation processes, food dispersion, and drug development/design.