Numerical Investigation of a Corrugated Heat Source Cavity: A Full Convection-Conduction-Radiation Coupling

Sadripour, Soroush

doi:10.11648/j.ajae.20170403.11

Cited by 13 publications

(25 citation statements)

References 43 publications

(61 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that various ribs and corrugations were adopted in the majority of the aforementioned numerical experiments to evaluate their influences on thermoconvective phenomena within a microchannel filled with colloidal dispersions. However, pertaining to the existing literature works [24,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48], it can be ascertained that the influence of corrugated-wall microchannels on the thermal-hydraulic behaviour of the thermoconvective mechanisms of an elasticoviscous fluid in a microchannel that is susceptible to magnetic flux density has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field

et al. 2021

View full text Add to dashboard Cite

In this study, the convective mode heat transfer phenomena of bi-phase elasticoviscous (non-Newtonian) nanofluid is quantified by forcefully flowing it through a specially designed microchannel test section. The test section, which is rectangularly cross-sectioned and annexed internally with cylindrical needle ribs is numerically investigated by considering the walls to be maintained at a constant temperature, and to be susceptible to a magnetizing force field. The governing system-state equations are numerically deciphered using control volume procedure and SIMPLEC algorithm. With the Reynolds number (Re) varying in the turbulent range from 3000 to 11,000, the system-state equations are solved using the Eulerian–Eulerian monofluid Two-Phase Model (TPM). For the purpose of achieving an apt geometry based on the best thermo-hydraulic behavior, an optimization study must be mandatory. The geometry of the cylindrical rib consists of h (10 × 10−3, 15 × 10−3, 20 × 10−3), p (1.0, 1.5), and d (8 × 10−3, 10 × 10−3, 12 × 10−3), which, respectively, defines the height, pitch, and diameter of the obstacles, with the dimensions placed within the braces being quantified in mm. The results demonstrated that the magnetic field leads to an enhanced amount of average Nusselt number (Nuav) in contrast with the occurrence at B = 0.0. This is due to the that the magnetic field pushes nanoparticles towards the bottom wall. It was found that B = 0.5 T has the maximum heat transfer compared with the other magnetic fields. The channel with h = 15 μm height leads to the maximum value of Nuav at all studied Re for constant values of d and h. The channel with p = 1.5 μm results in the maximum value of Nuav at all studied Re for constant values of d and h. The microchannel with d = 8 μm, p = 1.5 μm, and h = 15 μm in the presence of the magnetic field with B = 0.5 T is the best geometry in the present work.

show abstract

Section: Introductionmentioning

confidence: 99%

Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Therefore, it was extensively used in modern heat exchangers applicated in steam generation, condensation in power and cogeneration plants, chemical and agricultural products, automobile industry, etc. [44,45,46,47,48,49,50,51,52,53,54,55,56,57,58]. Hasanuzzamana et al 2007 [44], studied the natural convection in a square cavity having two V-wavy parallel vertical plates and two flat horizontal plates.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the heat transfer rate increased with the increase in surface waviness, aspect ratio, and nanoparticles volume fraction. Soroush et al 2017 [53], studied the turbulent free convection, conduction, and surface thermal radiation in a rectangular cavity with different shapes of heat source located at the bottom wall. It was noticed that employing the circular obstacles for heat source gave a higher heat transfer rate than other shapes only in low emissivity values.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Natural convection heat transfer in corrugated annuli with H2O-Al2O3 nanofluid

Aljabair

Mohammed

Alesbe

2020

Heliyon

View full text Add to dashboard Cite

The present work includes a numerical study of natural convection heat transfer in symmetrical and unsymmetrical corrugated annuli filled with H 2 O-Al 2 O 3 nanofluid. In this study, higher and lower temperatures were kept constant at inner and outer cylinders of the annulus; respectively. Eight mathematical models with an aspect ratio of 1.5 were developed to find the best model giving the highest heat transfer rates. The stream-vorticity formulation in curvilinear coordinates was used to solve the governing equations of heat transfer and fluid motion. The influences of Rayleigh number. ðð10 3 Ra 10 6 Þ and volume fraction of nanoparticles. (0 ϕ 0:25Þ on isotherms, streamlines, local and average Nusselt numbers on the inner and outer cylinder were investigated. The results show that the heat transfer rate is significantly increased with an increase in nanoparticles volume fraction and Rayleigh number. The activity of the heated surface is increased with an increase in the undulation number, but the flow motion tends to be most difficult in the spaces between active undulation walls. Moreover, the heat transfer rates in unsymmetrical annuli are relatively higher than the rates in the symmetrical annuli. There are no evident changes in isotherms with an increase in the nanofluid volume fraction. Correlations for the mean Nusselt number on the inner and outer walls of annulus were deduced as a function of Rayleigh number and nanoparticles volume fraction for eight models with an accuracy range of 8-15 %.

show abstract

“…Abbasian Arani et al [26] analyzed the effect of nanoparticle shape on thermal-hydraulic performance of boehmite alumina nanofluids in a sinusoidal wavy mini-channel with phase shift and variable wavelength. Sadripour et al [27] performed a numerical study for a full convection-conduction-radiation coupling in a cavity equipped with corrugated heat source. Moghaddaszadeh et al [28] examined the potential of using gear ring shape turbulators in a three-dimensional heat exchanger tube in view of entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Energy and Exergy Analysis of Using Turbulator in a Parabolic Trough Solar Collector Filled with Mesoporous Silica Modified with Copper Nanoparticles Hybrid Nanofluid

et al. 2020

View full text Add to dashboard Cite

Designing the most efficient parabolic trough solar collector (PTSC) is still a demanding and challenging research area in solar energy systems. Two effective recommended methods for this purpose that increase the thermal characteristics of PTSCs are adding turbulators and nanofluids. To study the effects of the two approaches on the energy efficiency of PTSCs, a stainless steel turbulator was used and solid nanoparticles of Cu/SBA-15 were added to the water with the volume concentrations of 0.019% to 0.075%. The generated turbulence in the fluid flow was modeled by the SST k–ω turbulent model. The results in daylight demonstrated that energy efficiency increases steadily by 11:30 a.m., and then, starts to drop gradually due to more irradiations at noon. It was observed that applying the turbulator to the studied PTSC has a significant influence on the enhancement of energy efficiency. Adding the nanoparticles augmented the average Nusselt number inside the solar collector in various studied Reynolds numbers. It was also found that the increase in volume concentrations of nanoparticles enhances heat transfer regularly.

show abstract

Numerical Investigation of a Corrugated Heat Source Cavity: A Full Convection-Conduction-Radiation Coupling

Cited by 13 publications

References 43 publications

Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field

Application of Cylindrical Fin to Improve Heat Transfer Rate in Micro Heat Exchangers Containing Nanofluid under Magnetic Field

Natural convection heat transfer in corrugated annuli with H2O-Al2O3 nanofluid

Energy and Exergy Analysis of Using Turbulator in a Parabolic Trough Solar Collector Filled with Mesoporous Silica Modified with Copper Nanoparticles Hybrid Nanofluid

Contact Info

Product

Resources

About