Magneto-hydrothermal triple-convection in a W-shaped porous cavity containing oxytactic bacteria

Abstract

Bioconvective heat and mass transport phenomena have recently been the subject of interest in diverse fields of applications pertaining to the motion of fluids and their thermophysical properties. The transport processes in a system involving triple convective phenomena, irregular geometry, and boundary conditions constitute a complex phenomenon. This work aims to explore the mixed thermo-bioconvection of magnetically susceptible fluid containing copper nanoparticles and oxytactic bacteria in a novel W-shaped porous cavity. The buoyant convention is generated due to the isothermal heating at the wavy bottom wall, whereas the mixed convection is induced due to the shearing motion of the top-cooled sliding wall. Furthermore, the bioconvection is induced due to the manifestation of oxytactic bacteria or organisms. The inclined sidewalls are insulated. The geometry is packed with water based Cu nanoparticle mixed porous structure, which is subjected to a magnetizing field acted horizontally. The complex transport equations are transformed into nondimensional forms, which are then computed using the finite volume-based developed code. The coupled triple-convective flow physics are explored for a wide range of involved controlling parameters, which could provide helpful insight to the system designer for its proper operation. The shape of geometry can be considered one of the important parameters to control the heat and mass transport phenomena. In general, the influence of amplitude (δ) is more compared to the waviness number (m) of the undulations. The magnitude of heat (Nu) and mass (Sh) transfer rate for the W-shaped cavity is high compared to conventional square and trapezoidal-shaped cavities. The output of the analysis could be very helpful for the designer for modeling devices operating on nanotechnology-based bioconvection, microbial fuel cells, and others.

Parametric studies of mixed convective fluid flow around cylinders of different cross‐sections

“…The motion of the fluid in the regions between the enclosure and the cylinder is enunciated with the stream function ($$\Psi )$$‐velocity relation given by Biswas et al, 8 Al‐Farhany et al, 28 and Adegun and Bello‐Ochende 29 : $$$U=\frac{\partial {\rm{\Psi }}}{\partial Y}\phantom{\rule{}{0ex}},\unicode{x02007}\unicode{x02007}V=-\frac{\partial {\rm{\Psi }}}{\partial X}.$$$…”

“…The popularity enjoyed by the bounded cavity problem among researchers is not only due to the simplicity of the geometry but also due to the practical significance of the subject. Furthermore, the associated flow field in this problem is used as a tool for checking the accuracy of new numerical codes being advanced, due to the ability to enact basic behavioral tendencies in incompressible flows, such as chaotic particle motion, transition, turbulence, three‐dimensional patterns, eddies, and so forth 7–9 …”

“…Furthermore, the associated flow field in this problem is used as a tool for checking the accuracy of new numerical codes being advanced, due to the ability to enact basic behavioral tendencies in incompressible flows, such as chaotic particle motion, transition, turbulence, threedimensional patterns, eddies, and so forth. [7][8][9] Consequently, as a result of the challenge of effectively increasing heat transfer, reducing thermal load, and boosting system effectiveness in several industrial and technical applications, including solar energy storage, mixing operations, food processing technology, drying chambers, coating processes, and microelectronic device cooling, there have been enormous research contributions on the numerical study of mixed convection flow in enclosures subjected to differential heating conditions. [10][11][12][13][14] Using two magnetic field configurations, thermomagnetic convection and entropy analysis in a ferrofluid-filled cubical cavity with a cylindrical heat source, as well as magnetohydrodynamic (MHD) mixed convection flow and heat transfer of a Cu-water nanofluid in a square cavity filled with a porous media, have been studied.…”

Optimization of wavy trapezoidal porous cavity containing mixture hybrid nanofluid (water/ethylene glycol Go–Al2O3) by response surface method

“…Their results show, The smaller porous medium and improved thermal conductivity ratio increase the local thermal non-equilibrium (LTNE) effects in the cavity. Biswas et al 35 numerically analyzed the fluid containing copper nanoparticles and oxytactic bacteria to investigate the physics of triple convection flow in a new W-shaped porous cavity. Closer shapes, such as square and trapezoidal enclosures, have been used to compare flow physics, heat transfer and mass transfer phenomena.…”

Entropy Analysis of Magnetized Carbon Nanofluid over Axially Rotating Stretching Disk

“…Recent research has looked at the effects of various constraints on liquid flow and heat transmission in a spinning fluid across a stretched disk [ 30 , 31 , 32 , 33 ]. Biswas et al [ 34 , 35 ] studied the several cases of nanofluid heat transfer in a W-shaped geometry. Ashraf et al [ 36 , 37 , 38 , 39 ] investigated the transient mixed convection flow along different surfaces numerically.…”