Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

Madani, K.

doi:10.18186/thermal.465650

Cited by 6 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a dynamic technique involving measurement of temperature rise at a fixed location from the source of heat using a single needle sensor acting as a heat source [27]. By measuring the temperature rise in the medium with respect to time the thermal conductivity of the medium is evaluated [43][44][45][46][47][48][49].…”

Section: Thermal Conductivity Measurementmentioning

confidence: 99%

Investigation of thermo-rheological properties of Fe3O4/Ethylene glycol nanofluid in a square cavity

KAMRAN,

QAYOUM

2023

Journal of Thermal Engineering

View full text Add to dashboard Cite

Many fluids used in heat transfer and transport phenomena restrict the effectiveness of heat exchange equipment on account of their low thermal conductivity. Using nanofluids, the ef-fectiveness of heat exchange equipment is enhanced by many folds. The use of magnetic nano-fluids for heat transfer generates a prospect of regulating flow and controlling the thermal and transport properties particularly the thermal conductivity and viscosity using an externally applied magnetic field. The present study involves synthesis of oleic acid-coated magnetic nanofluids at varying concentrations of 0 to 0.643% by volume, measurement of thermal conductivity, rheological properties and corresponding numerical simulation of Nanofluid in a heated square cavity. The thermal conductivity measurement have been carried out by transient hot-wire method using KD2-pro at varying concentrations of solid phase. The re-sults show a significant increase in thermal conductivity with increase in particle concentra-tion. Rheological measurements show variation in viscosity with shear rate, temperature and concentration. Moreover, it has been found that at low particle loading magnetic nanofluids exhibited Newtonian behavior unlike non-Newtonian behavior at increased concentration. Numerical simulation of the magnetic nanofluid in the heated square cavity demonstrates the immense potential of augmentation of heat transfer coefficient using such fluids.

show abstract

Section: Thermal Conductivity Measurementmentioning

confidence: 99%

Investigation of thermo-rheological properties of Fe3O4/Ethylene glycol nanofluid in a square cavity

KAMRAN,

QAYOUM

2023

Journal of Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…The highest heat transfer coefficient was found for a step height of 5 mm, 4 percent Al 2 O 3 nanofluids, and a Reynolds number of 25,000. Khadija et al [ 24 ] considered the influence of gaps between ribs in a micro-channel on thermal efficiency for nanofluids’ flow. They reported that increases in the Reynolds number and solid volume fraction of nanofluids, as well as a reduction in the gaps between the ribs, led to improved thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Efficient Heat Transfer Augmentation in Channels with Semicircle Ribs and Hybrid Al2O3-Cu/Water Nanofluids

Togun

Homod

Yaseen‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Global technological advancements drive daily energy consumption, generating additional carbon-induced climate challenges. Modifying process parameters, optimizing design, and employing high-performance working fluids are among the techniques offered by researchers for improving the thermal efficiency of heating and cooling systems. This study investigates the heat transfer enhancement of hybrid “Al2O3-Cu/water” nanofluids flowing in a two-dimensional channel with semicircle ribs. The novelty of this research is in employing semicircle ribs combined with hybrid nanofluids in turbulent flow regimes. A computer modeling approach using a finite volume approach with k-ω shear stress transport turbulence model was used in these simulations. Six cases with varying rib step heights and pitch gaps, with Re numbers ranging from 10,000 to 25,000, were explored for various volume concentrations of hybrid nanofluids Al2O3-Cu/water (0.33%, 0.75%, 1%, and 2%). The simulation results showed that the presence of ribs enhanced the heat transfer in the passage. The Nusselt number increased when the solid volume fraction of “Al2O3-Cu/water” hybrid nanofluids and the Re number increased. The Nu number reached its maximum value at a 2 percent solid volume fraction for a Reynolds number of 25,000. The local pressure coefficient also improved as the Re number and volume concentration of “Al2O3-Cu/water” hybrid nanofluids increased. The creation of recirculation zones after and before each rib was observed in the velocity and temperature contours. A higher number of ribs was also shown to result in a larger number of recirculation zones, increasing the thermal performance.

show abstract

“…Boiling heat transfer and bubble formation are wonderful phenomena with lots of complex mechanisms and sub-phenomena, which are most of the time unknown and need further research [1,2]. Generally, boiling occurs on the boundary between the liquid and vapour on which the pressure of liquid equals to its saturation pressure and the temperature is the main external parameter which causes the boiling phenomenon to occur [1,[3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The boiling mechanism is associated with the generation and movement of small bubbles which intensify the heat transfer between the liquid and vapour phases [7,8]. Hence, boiling heat transfer is a useful mechanism for cooling systems at high temperatures with large heat flux (HF) on the surface [2,[9][10][11][12]. Despite its promising thermal performance, some issues need to be addressed such as 1) The thermo-physical properties of the coolants such as heat capacity and thermal conductivity are normally low, which result in a reduction in the system performance.…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling Heat Transfer Characteristics of Titanium Oxide/Water Nanofluid (Tio2/Di Water) in an Annular Heat Exchanger

Nakhjavani

Zadeh

2020

Journal of Thermal Engineering

View full text Add to dashboard Cite

A range of experiments was conducted to measure the heat transfer characteristics of titanium oxide/deionized water nanofluid (NF) inside a steel-made Pyrex annular system. A set of experiments was designed and performed at inlet temperature (IT) of the NF (333 K-363 K), the applied heat flux (AHF) (4.98 kW/m 2 to 112 kW/m 2 ), 1988 < Re < 13,588 and dispersion concentration of wt.%=0.05 to wt.%=0.15) on the average heat transfer coefficient (HTC) and boiling section's average pressure drop (PD). It was demonstrated that the increase in the volume flow and the AHF can increase the HTC while increasing the weight concentration of the NF, initially increased the HTC such that the maximum enhancement in the HTC was 35.7% at wt.%=0.15 and Re=13500, however, over the time, the HTC of the NF decreased. The reduction in HTC was attributed to the formation of continual sedimentation on the boiling surface after 1000 minutes of the operation. The IT of the NF slightly increased the HTC, which was due to the enhancement in the thermal and physical properties such as thermal conductivity. The maximum enhancement in HTC due to increase of the IT from 333 K to 363 K was 4.2% at wt.%=0.15 and Re=13500. The bubble formation was also found to be a strong function of the applied HF such that with increasing the HF, the rate of the bubble formation increased, which was also the reason behind the augmentation in the HTC at larger AHFs. Also, the PD was augmented due to the increase in the velocity and flow and also weight concentration of NF. The highest value measured for PD was 9 kPa recorded at a weight fraction of 0.15 and Re=13500, which was 28% larger than that of measured for the base fluid. It was also found that a continual fouling layer of nanoparticles (NPs) was formed on the boiling surface, which induced a thermal resistance against the boiling heat transfer. The fouling formation reduced the HTC of the NF such that the maximum reduction in the HTC was 21.6% after 1000 minutes of the operation of the heater.

show abstract

Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

Cited by 6 publications

References 20 publications

Investigation of thermo-rheological properties of Fe3O4/Ethylene glycol nanofluid in a square cavity

Investigation of thermo-rheological properties of Fe3O4/Ethylene glycol nanofluid in a square cavity

Efficient Heat Transfer Augmentation in Channels with Semicircle Ribs and Hybrid Al2O3-Cu/Water Nanofluids

Flow Boiling Heat Transfer Characteristics of Titanium Oxide/Water Nanofluid (Tio2/Di Water) in an Annular Heat Exchanger

Contact Info

Product

Resources

About