Wyniki wyszukiwania - BazTech

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Impacts of chemical reaction, thermal radiation, and heat source/sink on unsteady MHD natural convective flow through an oscillatory infinite vertical plate in porous medium

Saikia Dibya Jyoti, Ahmed Nazibuddin

International Journal of Applied Mechanics and Engineering

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2023

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Vol. 28, no. 4

114--136

EN

The main objective of this exploration is to analyze the effects of heat source/sink, chemical reactions, and radiation on the unsteady free convective flow through a porous medium using an infinitely oscillating vertical plate. The Laplace transformation tactics is utilized to solve the governing equations for concentration, energy, and momentum. The simulation results demonstrate that the chemical reaction parameter dwindles both primary and secondary velocities. It has been noted that an upsurge in heat generation (heat source) enhances the temperature field, while a decrease in heat absorption (heat sink) leads to a reduction in the temperature field. Furthermore, the radiation parameter causes a drop in both temperature and velocity patterns. The equation for skin friction is derived and presented graphically, and 3-dimensional surface plots are provided to depict the Nusselt number and Sherwood number. Additionally, graphical illustrations are employed to showcase the influence of various non-dimensional variables on concentration, temperature, and velocity patterns.

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An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet embedded in a porous medium

Kumar K. G., Gireesha B. J., Rudraswamy N. G., Krishnamurthy M. R.

International Journal of Applied Mechanics and Engineering

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2019

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Vol. 24, no. 2

245--258

EN

An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet was numerically studied by considering the effect of chemical reaction and thermal radiation. The governing non-linear partial differential equations describing the flow problem are reduced to a system of non-linear ordinary differential equations using the similarity transformations and solved numerically using the Runge–Kutta–Fehlberg fourth–fifth order method. Numerical results for concentration, temperature and velocity profiles are shown graphically and discussed for different physical parameters. Effect of pertinent parameters on momentum, temperature and concentration profiles along with local Sherwood number, local skin-friction coefficient and local Nusselt number are well tabulated and discussed.

3

Resorbowalne porowate podłoża polimerowe dla inżynierii tkankowej

Pamuła E., Buczyńska J., Menaszek E., Bacakova L., Dobrzyński P., Bero M.

Chemik

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2005

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Vol. 58, nr 2

57-62

PL

W pracy przedstawiono wyniki badań nad otrzymywaniem z kopolimerów i terpolimerów L-laktydu, glikolidu i e-kaprolaktonu, trójwymiarowych porowatych podłoży do hodowli tkanek dla inżynierii tkankowej. Kopolimery i terpolimery zsyntezowano wykorzystując nietoksyczny związek cyrkonu jako inicjator. Opracowane podłoża mają wysoką porowatość otwartą, a wielkość ich porów może być kontrolowana, w zależności od potrzeb, w bardzo szerokim zakresie. Czas degradacji podłoży zależy od składu chemicznego polimeru. Badania in vitro wykazały, że komórki łatwo zasiedlają zarówno powierzchnię jak i wnętrze podłoży. Czas degradacji podłoży w warunkach in vivo, jest zbliżony do ich czasu degradacji in vitro.

EN

This paper presents the findings on manufacturing of porous three-dimensional scaffolds from co- and terpolymers of L-lactide, glycolide and e-caprolactone, aimed at cell culturing for tissue engineering. Such materials were synthesized with the use of non-toxic zirconium compound as an initiator. The obtained scaffolds have high open porosity and their size of pores can be controlled in a wide range, depending on medical application. Degradation time of porous scaffolds depends on chemical composition of polymers. The studies carried out in vitro show that cells easy colonize surface as well as inner parts of the scaffolds. Degradation time of scaffolds in vivo is close to that in vitro.