Sukumar Pati

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Numerical study of the vortex‐induced electroosmotic mixing of non‐Newtonian biofluids in a nonuniformly charged wavy microchannel: Effect of finite ion size

Sumit Kumar Mehta, Sukumar Pati, Pranab Kumar Mondal

We propose a micromixer for obtaining better efficiency of vortex induced electroosmotic mixing of non‐Newtonian bio‐fluids at a relatively higher flow rate, which finds relevance in many biomedical and biological applications. To represent the rheology of non‐Newtonian fluid, we consider the Carreau model in this study, while the applied electric field drives the constituent components in the micromixer...

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Analysis of thermo-hydraulic performance and entropy generation characteristics for laminar flow through triangular corrugated channel

Sumit Kumar Mehta, Sukumar Pati

Journal of Thermal Analysis and Calorimetry > 2019 > 136 > 1 > 49-62

We analyse the thermo-hydraulic performance and entropy-generation characteristics for laminar flow through triangular corrugated channel. Results are presented in terms of heat transfer, pressure drop and entropy generation for different values of amplitude of waviness of the channel, wavelength and Reynolds number in the range of 5–500. It is found that the rate of heat transfer is augmented with...

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Hydrothermal performance and entropy generation analysis for mixed convective flows over a backward facing step channel with baffle

Manash Protim Boruah, Pitambar R. Randive, Sukumar Pati

International Journal of Heat and Mass Transfer > 2018 > 125 > C > 525-542

In this work, we numerically investigate the thermo-hydraulic characteristics and entropy generation for mixed convective flow through a backward facing step channel with baffle. The effect of baffle geometry is studied by considering three different shapes for the baffle viz. square, triangular and elliptical and two different baffle sizes viz. h_b × w_b = 1 × 1 and h_b × w_b = 2 × 2 designated as B1...

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Numerical investigation of thermo-hydraulic transport characteristics in wavy channels: Comparison between raccoon and serpentine channels

Sukumar Pati, Sumit Kumar Mehta, Abhijit Borah

International Communications in Heat and Mass Transfer > 2017 > 88 > C > 171-176

Numerical experiments have been performed to investigate the thermo-fluidic transport characteristics for laminar flow through sinusoidal wavy walled channel. The heat transfer and pressure drop characteristics are assessed for two different channels, namely, raccoon and serpentine for different values of amplitude and wavelength of the wall waviness. Our results reveal that the dependence of heat...

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Evaporation of multicomponent liquid fuel droplets: Influences of component composition in droplet and vapor concentration in free stream ambience

Santosh Gavhane, Sukumar Pati, S.K. Som

International Journal of Thermal Sciences > 2016 > 105 > C > 83-95

Theoretical studies have been made to explore the coupling influences of droplet constituent compositions and free stream vapor concentrations on evaporation characteristics, namely, mass depletion rate and droplet temperature of a heptane-dodecane droplet (components with widely varying volatility) and methanol-ethanol droplet (components with close volatility) at lower and higher free stream temperatures...

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Influence of wavy wall and non-uniform heating on natural convection heat transfer and entropy generation inside porous complex enclosure

Saurabh Bhardwaj, Amaresh Dalal, Sukumar Pati

Energy > 2015 > 79 > C > 467-481

The present work numerically analyses the heat transfer and entropy generation characteristics in a two-dimensional porous right-angled triangular enclosure with undulations on the left wall. The enclosure is heated sinusoidally from the bottom wall, while the left wall is maintained at a uniform temperature lower than the bottom one and the right inclined wall is adiabatic. The stream function-vorticity...

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Film condensation in presence of non-condensable gases: Interplay between variable radius of curvature and interfacial slip

Sukumar Pati, P. Kaushik, Suman Chakraborty, S.K. Som

International Communications in Heat and Mass Transfer > 2014 > 56 > Complete > 31-36

A theoretical study has been executed to investigate the implications of interfacial slip in presence of non-condensable species in the bulk mixture of vapour on heat transfer characteristics in film condensation over horizontal tubes with varying radius of curvature. A polar surface comprising a segment of an equiangular spiral in the form of Rp=ae ^mθ (a and m being parametric constants),...

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Combined influences of electrostatic component of disjoining pressure and interfacial slip on thin film evaporation in nanopores

Sukumar Pati, S.K. Som, Suman Chakraborty

International Journal of Heat and Mass Transfer > 2013 > 64 > Complete > 304-312

Transport characteristics of evaporating thin liquid films in nanopores play a critical role in designing effective thermal management of high performance electronic devices and systems. In such devices and systems, the thin film evaporating region is formed as a combined consequence of the capillary and long-range intermolecular forces. Traditionally, dispersion forces are considered as the dominant...

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Slip-driven alteration in film condensation over vertical surfaces

Sukumar Pati, S.K. Som, Suman Chakraborty

International Communications in Heat and Mass Transfer > 2013 > 46 > Complete > 37-41

Nusselt's classical theory on film condensation over vertical surfaces is extended to incorporate the effects of interfacial slip. The governing equations of mass, momentum and energy conservation in the liquid phase are solved analytically, so as to derive a closed form expression for the condensate film thickness and the local Nusselt number in terms of other relevant parameters. It is revealed...

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Thermodynamic performance of microscale swirling flows with interfacial slip

Sukumar Pati, S.K. Som, Suman Chakraborty

International Journal of Heat and Mass Transfer > 2013 > 57 > 1 > 397-401

With the deployment of a merit function combining the first and second laws of thermodynamics, we delineate the possibilities of exploiting interfacial slip towards improving the thermodynamic performance of microscale swirling flows to a considerable extent. Our studies further reveal that an arrest in the increment in thermodynamic irreversibility relative to the rate of augmentation in the transport...

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Hydrodynamic and thermal transport characteristics of swirling flows through microchannels with interfacial slip

P. Kaushik, Sukumar Pati, S.K. Som, Suman Chakraborty

International Journal of Heat and Mass Transfer > 2012 > 55 > 15-16 > 4359-4365

Fluid flow and heat transfer characteristics of decaying laminar swirling flow of liquids in microchannels have been theoretically investigated, with the consideration of interfacial slip. The effects of slip–swirl interactions on friction factor and Nusselt number have been investigated. The effect of swirl is found to increase the friction factor, while the velocity slip tends to decrease the same,...

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Influence of ambient vapor concentration on droplet evaporation in a perspective of comparison between diffusion controlled model and kinetic model

Sukumar Pati, Suman Chakraborty, S.K. Som

International Journal of Heat and Mass Transfer > 2011 > 54 > 21-22 > 4580-4584

A comparative study of purely diffusion controlled, kinetic, and empirical models has been executed on the predictions of evaporation characteristics of water droplet in a quiescent ambience of air with varying vapor concentrations at different pressures and temperatures. A significant increase in droplet lifetime with free stream vapor concentration has been observed at lower values of the free stream...

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Search results for: Sukumar Pati

Numerical study of the vortex‐induced electroosmotic mixing of non‐Newtonian biofluids in a nonuniformly charged wavy microchannel: Effect of finite ion size

Analysis of thermo-hydraulic performance and entropy generation characteristics for laminar flow through triangular corrugated channel

Hydrothermal performance and entropy generation analysis for mixed convective flows over a backward facing step channel with baffle

Numerical investigation of thermo-hydraulic transport characteristics in wavy channels: Comparison between raccoon and serpentine channels

Evaporation of multicomponent liquid fuel droplets: Influences of component composition in droplet and vapor concentration in free stream ambience

Influence of wavy wall and non-uniform heating on natural convection heat transfer and entropy generation inside porous complex enclosure

Film condensation in presence of non-condensable gases: Interplay between variable radius of curvature and interfacial slip

Combined influences of electrostatic component of disjoining pressure and interfacial slip on thin film evaporation in nanopores

Slip-driven alteration in film condensation over vertical surfaces

Thermodynamic performance of microscale swirling flows with interfacial slip

Hydrodynamic and thermal transport characteristics of swirling flows through microchannels with interfacial slip

Influence of ambient vapor concentration on droplet evaporation in a perspective of comparison between diffusion controlled model and kinetic model

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