Numerical investigation of transient mixed convection of nanofluid in a cavity with non-Darcy porous inner block and rotating cylinders with harmonic motion

Shirani, Nima; Toghraie, Davood

doi:10.1038/s41598-021-96733-6

Cited by 16 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This article conducted rapid starting and stopping external characteristic experiments on an atypical open impeller low specific speed centrifugal pump, and obtained the transient external characteristic changes during the starting and stopping processes, but did not conduct numerical simulation calculations. Further and more detailed internal characteristics research [26][27][28] will be conducted on atypical open impeller low specific speed centrifugal pumps using numerical simulation in the next work.…”

Section: Discussionmentioning

confidence: 99%

Transient Hydraulic Performance of a Prototype Pump during Starting and Stopping Periods

Zheng,

Ye,

Zhao

et al. 2023

Processes

View full text Add to dashboard Cite

In order to meet different operational requirements, existing low specific speed centrifugal pumps may have to be run at high speeds. Therefore, it is crucial to understand the transient performance of such centrifugal pumps during high speed starting and stopping. However, there are currently no experiments on the starting and stopping of low specific speed centrifugal pumps. In this paper, transient hydraulic performance experiments during starting and stopping had been carried out on an atypical open impeller centrifugal pump with a rated flow rate of 6 m3/h using an updated test rig. The correlation of speed, flow, head and shaft power with time was obtained for four flow ratios of 0.353, 1.022, 1.654 and 2.343 operating conditions. It was found that the fluctuation of the shaft power curve was the strongest during the starting process, and there was a significant impact phenomenon. The corresponding impact shaft power from small to large flow rates were 0.167 kW, 0.409 kW, 0.234 kW and 0.215 kW, and the shaft power impact phenomenon was the most obvious under rated operating conditions. During the stopping process, the speed, flow rate and head all remain stable for a small period of time, and the time required to decrease to 0 is longer than the time required to reach a stable state during starting. During stopping, the shaft power will instantly decrease, accompanied by varying degrees of fluctuations.

show abstract

Section: Discussionmentioning

confidence: 99%

Transient Hydraulic Performance of a Prototype Pump during Starting and Stopping Periods

Zheng,

Ye,

Zhao

et al. 2023

Processes

View full text Add to dashboard Cite

show abstract

“…The first description of transport phenomena via porous media was proposed in 1956 through Darcy Henry [25]. At the present time, following Darcy's effortless work, fluid flows over a porous medium are attracting the attention of a prodigious scientific community including [26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Flow Dynamics of Eyring–Powell Nanofluid on Porous Stretching Cylinder under Magnetic Field and Viscous Dissipation Effects

Rikitu

2023

Advances in Mathematical Physics

View full text Add to dashboard Cite

The current paper scrutinized the flow dynamics of Eyring–Powell nanofluid on porous stretching cylinder under the effects of magnetic field and viscous dissipation by employing Cattaneo–Christov theory. In order to study impacts of thermophoretic force and Brownian motion, the two-phase (Buongiorno) model is considered. As a consequence, very nonlinear PDEs that govern flow problem were formulated, transformed into ODEs via relevant similarity variables, as well as tackled by utilizing R-K-45 integration scheme along with the shooting technique in the MATLAB R2018a software. Consequently, the numerical simulations reveal that Eyring–Powell fluid, curvature, velocity ratio parameters have the propensity to raise nanofluid velocity. Nanofluid temperature shows an increasing pattern with magnetic, curvature, dissipative heating, and thermophoresis parameters. Besides, Prandtl number, Eyring–Powell fluid, velocity ratio, thermal relaxation time, and porous parameters indicate the declining impact against the nanofluid temperature. Hence, the porous medium reasonably and successfully managed nanofluid temperature as well as the overall thermal system in terms of system cooling. The concentration profile gets fall down with escalating values of Schmidt number, magnetic, curvature, dissipative heating, thermophoresis, Brownian motion, and solutal relaxation time parameters. Moreover, coefficient of the skin friction gets rise for larger values of Eyring–Powell fluid, magnetic and curvature parameters however porous medium and velocity ratio parameters reveal the opposite trends on it. The magnetic, curvature, Eyring–Powell fluid, velocity ratio, and dissipative heating parameters indicate increasing impacts on both Nusselt N u and Sherwood S h numbers even though both N u and S h get cut down with the porous medium parameter. Moreover, an excellent and sound agreement was attained up on comparing coefficients of the skin friction for the current result against that of previously published literatures under some limiting cases.

show abstract

“…They detected that higher Darcy number values improve the temperature gradi-ents around the heated areas and hence increase the average Nusselt number. Shirani and Toghraie 34 numerically analyzed the mixed convective Cu-water nanoliquid flow within a porous cavity with the Forchheimer-Brinkman-extended Darcy model. They determined that with a decrement in Darcy parameter, the Nusselt number rises.…”

Section: Introductionmentioning

confidence: 99%

Comparative heat transfer analysis of electroconductive Fe3O4–MWCNT– water and Fe3O4–MWCNT– kerosene hybrid nanofluids in a square porous cavity using the non-Fourier heat flux model

et al. 2022

View full text Add to dashboard Cite

The analysis on heat transmission and fluid flow characteristics within the cavity is useful to improve the features of several applications including energy storage devices and hybrid fuel cells. With this motivation, the present model investigates the characteristics of magneto-convective heat transmission and fluid flow within a square porous enclosure with hot and cold slits. The heat transfer features of electrically conducting hybrid nanofluids Fe3O4-MWCNT-water and Fe3O4-MWCNT-kerosene is analyzed inside the enclosure. The non-Fourier thermal flux model is deployed and the internal heat absorption/generation effect is considered. The Marker-And-Cell (MAC) numerical scheme is adopted to solve the transformed dimensionless mathematical model with associated initial-boundary conditions. An exhaustive parametric investigation is implemented to estimate the influence of key parameters on the transport phenomena. The computations show that augmenting the Hartmann number values modify the fluid flow and temperature features substantially for both the hybrid nanofluids. Enhancing the values of nanoparticles volume fraction promotes the heat transfer. When 5% Fe3O4-MWCNT nanoparticles are suspended into water and kerosene base fluids, Fe3O4-MWCNT-kerosene hybrid nanofluid achieves 6.85% higher mean heat transfer rate compared to Fe3O4-MWCNT-water hybrid nanoliquid. In the existence of heat absorption, the mean rate of heat transfer of Fe3O4-MWCNT-water hybrid nanofluid is 78.92% lower than Fe3O4-MWCNT-kerosene hybrid nanoliquid. Greater energy transmission is noticed in the case of Fe3O4-MWCNT-kerosene hybrid nanofluid and the enhanced fluid flow is noticed in the case of Fe3 O4-MWCNT-water hybrid nanofluid. Fourier's model (δe=0) estimates higher heat transfer rate than that of the Cattaneo-Christov (non-Fourier) heat flux model (δe≠0).

show abstract

Numerical investigation of transient mixed convection of nanofluid in a cavity with non-Darcy porous inner block and rotating cylinders with harmonic motion

Cited by 16 publications

References 49 publications

Transient Hydraulic Performance of a Prototype Pump during Starting and Stopping Periods

Transient Hydraulic Performance of a Prototype Pump during Starting and Stopping Periods

Flow Dynamics of Eyring–Powell Nanofluid on Porous Stretching Cylinder under Magnetic Field and Viscous Dissipation Effects

Comparative heat transfer analysis of electroconductive Fe3O4–MWCNT– water and Fe3O4–MWCNT– kerosene hybrid nanofluids in a square porous cavity using the non-Fourier heat flux model

Contact Info

Product

Resources

About