Department of Mechanical Engineering
Recent Submissions
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Design and fabrication of a microfluidic device for synthesis of chitosan nanoparticles
(ASME, 2013-08)Chitosan nanoparticles have a biodegradable, biocompatible, nontoxic structure, and are commonly used for drug delivery systems. In this study, design, modeling, and fabrication methodology of a microfluidic device for the ... -
Analysis of amplitude modulation atomic force microscopy in aqueous salt solutions
(Elsevier, 2014-11-01)We present a numerical analysis of amplitude modulation atomic force microscopy in aqueous salt solutions, by considering the interaction of the microscope tip with a model sample surface consisting of a hard substrate and ... -
Multiscale hydro-thermo-chemo-mechanical coupling: Application to alkali-silica reaction
(Elsevier, 2014-03)Alkali-Silica Reaction (ASR) is a complex chemical process that affects concrete structures and so far various mechanisms to account for the reaction at the material level have already been proposed. The present work adopts ... -
A mixed formulation of mortar-based contact with friction
(Elsevier, 2013-03-01)A classical three-field mixed variational formulation of frictionless contact is extended to the frictional regime. The construction of the variational framework with respect to a curvilinear coordinate system naturally ... -
Atom-specific forces and defect identification on surface-oxidized Cu(100) with combined 3D-AFM and STM measurements
(American Physical Society, 2013-04-12)The influence of defects on the local structural, electronic, and chemical properties of a surface oxide on Cu(100) were investigated using atomic resolution three-dimensional force mapping combined with tunneling current ... -
Analysis of heat transfer and entropy generation for a low-Peclet-number microtube flow using a second-order slip model: an extended-Graetz problem
(Springer, 2014-08-30)The classical Graetz problem, which is the problem of the hydrodynamically developed, thermally developing laminar flow of an incompressible fluid inside a tube neglecting axial conduction and viscous dissipation, is one ... -
Artifacts related to tip asymmetry in high-resolution atomic force microscopy and scanning tunneling microscopy measurements of graphitic surfaces
(American Vacuum Society, 2015-03-20)The effect of tip asymmetry on atomic-resolution scanning tunneling microscopy and atomic force microscopy measurements of graphitic surfaces has been investigated via numerical simulations. Employing a three-dimensional, ... -
On the optimality of the window method in computational homogenization
(Elsevier, 2013-03)The window method, where the microstructural sample is embedded into a frame of a homogeneous material, offers an alternative to classical boundary conditions in computational homogenization. Experience with the window ... -
Microfluidic bio-particle manipulation for biotechnology
(Elsevier, 2014-11-15)Microfluidics and lab-on-a-chip technology offers unique advantages for the next generation devices for diagnostic therapeutic applications. For chemical, biological and biomedical analysis in microfluidic systems, there ... -
Multiscale thermomechanical contact: Computational homogenization with isogeometric analysis
(John Wiley & Sons, 2014-12-13)A computational homogenization framework is developed in the context of the thermomechanical contact of two boundary layers with microscopically rough surfaces. The major goal is to accurately capture the temperature jump ... -
An interior point method for isogeometric contact
(Elsevier, 2014-07-01). The interior point method is applied to frictionless contact mechanics problems and is shown to be a viable alternative to the augmented Lagrangian approach. The method is derived from a mixed formulation which induces ... -
Isogeometric Analysis and thermomechanical Mortar contact problems
(Elsevier, 2014-06-01)Thermomechanical Mortar contact algorithms and their application to NURBS based Isogeometric Analysis are investigated in the context of nonlinear elasticity. Mortar methods are applied to both the mechanical field and the ... -
A mixed formulation of mortar-based frictionless contact
(Elsevier, 2012-06-01)A class of mortar-based frictionless contact formulations is derived based on a classical three-field mixed variational framework. Within a penalty regularization complemented by Uzawa augmentations, discrete mortar ... -
A large deformation frictional contract formulation using NURBS-based isogeometric analysis
(John Wiley & Sons, 2011-02-23)This paper focuses on the application of NURBS-based isogeometric analysis to Coulomb frictional contact problems between deformable bodies, in the context of large deformations. A mortar-based approach is presented to ... -
Numerical modeling of acoustophoretic particle separation for microfluidics
(Springer, 2014-04-22)A numerical simulation methodology for ultrasonic particle/cell separation and cell washing processes is introduced and validated by comparing with the results from the literature. In this study, a finite element approach ... -
Microchannel heat transfer with slip flow and wall effects
(American Institute of Aeronautics and Astronautics, 2014-04-10)Analysis is presented for conjugate heat transfer in a parallel-plate microchannel. Axial conduction in the fluid and in the adjacent wall is included. The fluid is a constant property gas with a slip-flow velocity ... -
Multi-Temperature Zone, Droplet-based Microreactor for Increased Temperature Control in Nanoparticle Synthesis
(Wiley, 2014-12-12)Microreactors are an emerging technology for the controlled synthesis of nanoparticles. The Multi-Temperature zone Microreactor (MTM) described in this work utilizes thermally isolated heated and cooled regions for the ... -
Probing three-dimensional surfaces force fields with atomic resolution: Measurement strategies, limitations, and artifact reduction
(Beilstein-Institut., 2012-09-11)Noncontact atomic force microscopy (NC-AFM) is being increasingly used to measure the interaction force between an atomically sharp probe tip and surfaces of interest, as a function of the three spatial dimensions, with ... -
Piloted Evaluation of a Control Allocation Technique to Recover from Pilot-Induced Oscillations
(AIAA, 2014-10-07)This paper describes the maturation of a control allocation technique designed to assist pilots in recovery from pilot-induced oscillations. The control allocation technique to recover from pilot-induced oscillations is ... -
Simultaneous measurement of multiple independent atomic-scale Interactions using scanning probe microscopy: data interpretation and the effect of cross-talk
(American Chemical Society, 2015-03-05)In high-resolution scanning probe microscopy, it is becoming increasingly common to simultaneously record multiple channels representing different tip-sample interactions to collect complementary information about the ...
