Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Subject: search.filters.subject.Diffusion

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    Selective image smoothing and feature enhancement using modified shock filters
    (2011) Bini, A.A.; Bhat, M.S.
    Shock filters are widely used for image enhancement and deblurring. These filters make use of nonlinear hyperbolic Partial Differential Equations (PDEs) in order to sharpen the edges. However, in many practical cases images are corrupted by noise and other kind of degradations. Convensional shock filters are not suitable in such cases as they enhance the noise present in the image. Hence, the idea of combining shock filters with diffusion yield good results. In this paper we propose a modified "diffusion coupled shock filter." The proposed method makes use of an 'adaptive diffusion term' which limits the extent of smoothing on important edges making them more sharper. The experimental results demonstrate the efficiency of the proposed method to control diffusion and to make the reconstruction more reliable. © 2011 IEEE.
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    Development of micromixer for efficient mixing of blood and insulin in human arteries
    (Elsevier Ltd, 2023) Bagde, P.; Nayak, N.; Arumuga Perumal, D.
    In the present work, the computational analysis of passive micromixer with embedded obstacles is studied in detail. It also focuses on Y shaped microchannel with internal embedded obstacles. Different types of Y shaped microchannels are designed by altering the cross section, mixing length and number of obstacles. For simplicity, same velocities at both blood and insulin inlets are assumed. Microchannels are designed in CATIA V5 software and simulations were performed using ANSYS CFX 19.0 solver for steady state condition. Identification of geometric variables correlation with flow field variables is considered for better mixing design. Simulation results are compared with the help of calculating volume fraction at each section and average volume fraction at outlet with each other. It is found that, microchannel having rectangular cross section with circular and rectangular obstacles with reduced length for insulin inlet is giving highest average volume fraction at outlet. Also, one with elliptical cross section is able to give uniform average volume fraction at outlet. By observing mixing profile, it is seen that there is significant increase in mixing behaviour by introducing embedded obstacles as compared to without using it. © 2022