Experimental investigation on heat transfer and pressure drop of MWCNT - Solar glycol based nanofluids in shot peened double pipe heat exchanger

Poongavanam, Ganesh Kumar; Panchabikesan, Karthik; Murugesan, Renuka; Saravanakumar, Duraisamy; Velraj, R.

doi:10.1016/j.powtec.2019.01.081

Cited by 55 publications

(15 citation statements)

References 55 publications

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“…[23] According to these research results, CBNFs can improve the HTC or heat exchange capacity of HEs, mainly because CBNFs have higher thermal conductivity (k), strong Brownian motion, collision behavior between CBNMs and CBNMs with the wall of the HE, and a high energy delivery rate of CBNMs [12,13,15,21]. However, the use of CBNFs as the working fluid of the HE increases the ∆P of the HE mainly because of the higher viscosity (µ) of CBNFs [13,15,[22][23][24][25][26]. High-concentration CBNFs do not necessarily have better heat transfer performance than low-concentration CBNFs [15,22].…”

Section: Phementioning

confidence: 99%

“…Many researchers have applied CBNFs to air-cooled heat exchangers (ACHEs) or radiators [12][13][14][15], shell and tube heat exchangers [16][17][18], plate heat exchangers (PHE) [19][20][21][22][23], and double tube or tube heat exchangers [24][25][26] to improve heat exchange performance. In addition, different base fluids (BFs) such as water (W), ethylene glycol aqueous solution (EG-W) and lubricating oil are configured CBNFs for adapting to different use objects and temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Lue

Teng

et al. 2021

Applied Sciences

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The wet ball milling method was used and a dispersant (gum Arabic) was added to prepare various concentrations (0.05 and 0.2 wt%) of carbon-based nanofluids (CBNFs) by a two-step synthesis method as working fluids for heat exchange. CBNFs were actually used in a tube heat exchanger (THE) for heat transfer performance experiments. The heat transfer performance of water and CBNFs was estimated under different heating powers and flow rates of working fluid. The pump power consumption (Ppe) of 0.05 wt% CBNF was found to be similar to that of water, but the Ppe of 0.2 wt% CBNF was higher than that of water. The convective heat transfer coefficient (HTC) of CBNF in the was higher than that of water, and the HTC of 0.05 wt% and 0.2 wt% CBNF was optimal at the heating power of 120 W and 80 W, respectively. The average HTC of 0.05 wt% CBNFs at 120 W heating power was about 3.33% higher than that of water, while that of 0.2 wt% CBNFs at 80 W heating power was about 4.52% higher than that of water. Considering the Ppe and HTC concomitantly, the best overall system performance was exhibited by 0.05 wt% CBNFs.

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Section: Phementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Lue

Teng

et al. 2021

Applied Sciences

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“…The average heat transfer rate in the heat exchanger is calculated from Equation (1) and presented with a

term [ 41 ]:

where A is the surface area of the inner tube, U is overall heat transfer coefficient of a double pipe, and ∆ T lm is the logarithmic mean temperature difference for counter-flow conditions, and the thermal resistance is calculated according to Equation (2) [ 4 , 5 ]:

where k is the thermal conductivity of the tube material, and A o and A i are the inner and outer areas of the inner tube, respectively. h nf and h w represent the convective heat transfer coefficient of the nanofluid and water, respectively.…”

Section: Effects Of Nanofluid Characteristics On Heat Transfer Rate A...mentioning

confidence: 99%

“…The pressure drop is directly related to the nanofluid velocity and the density and is calculated according to Equation (7) [ 41 ]:

where Δ P nf , ρ nf , u nf , f nf , and L i are the nanofluid pressure drop, density, friction factor, velocity, and heat exchanger length, respectively. The friction factor is calculated by Equation (8) [ 5 ]:

…”

Section: Effects Of Nanofluid Characteristics On Heat Transfer Rate A...mentioning

confidence: 99%

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

et al. 2022

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Nanofluids can be employed as one of the two fluids needed to improve heat exchanger performance due to their improved thermal and rheological properties. In this review, the impact of nanoparticles on nanofluid properties is discussed by analyzing factors such as the concentration, size, and shape of nanoparticles. Nanofluid thermophysical properties and flow rate directly influence the heat transfer coefficient and pressure drop. High thermal conductivity nanoparticles improve the heat transfer coefficient; in particular, metallic oxide (such as MgO, TiO2, and ZnO) nanoparticles show greater enhancement of this property by up to 30% compared to the base fluid. Nanoparticle size and shape are other factors to consider as well, e.g., a significant difference in thermal conductivity enhancement from 6.41% to 9.73% could be achieved by decreasing the Al2O3 nanoparticle size from 90 to 10 nm, affecting nanofluid viscosity and density. In addition, equations to determine the heat transfer rate and the pressure drop in a double-pipe heat exchanger are presented. It was established that the main factor that directly influences the heat transfer coefficient is the nanofluid thermal conductivity, and nanofluid viscosity affects the pressure drop.

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“…The heat transfer coefficient (HTC) and thermodynamics properties of nanofluid are considerably greater than the base fluid. 5 The higher heat transfer rate from the nanomaterials to the base liquid is promising owing to the larger surface area and micro-convection at the surroundings of dispersed nanomaterials. 6 Adding nanomaterials in the base liquid enhances the optical characteristics namely extinction coefficient, absorption, and transmission.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on photothermal conversion using solar glycol/MWCNTs based nanofluids

Kumar

Vigneswaran

Sakthivadivel

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This article deals with the photothermal conversion performance of solar glycol – multiwall carbon nanotubes based nanofluids were studied with various weight concentrations and time. A broad investigation was performed with various nanofluid samples with the help of a sun simulator. The measurement was conducted with solar glycol-MWCNTs based nanofluids with 0.1%, 0.2%, and 0.3% volume concentration respectively. The heat loss was reduced by insulation material, whereas the nanofluid samples were heated with the help of a sun simulator. The difference in temperature of 7.7°C was attained for the 0.3 vol.% nanofluid as compared with solar glycol. Compared with solar glycol the temperature of MWCNT-SG based nanofluid at the volume concentration of 0.3% was augmented by about 69.21% with a light irradiation time of 10 min. The experimental results confirm that the SG\MWCNTs based can be used as the right replacement for heat transfer fluids for direct absorption solar collector system applications.

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Experimental investigation on heat transfer and pressure drop of MWCNT - Solar glycol based nanofluids in shot peened double pipe heat exchanger

Cited by 55 publications

References 55 publications

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Enhanced Heat Transfer Performance of the Tube Heat Exchangers Using Carbon-Based Nanofluids

Application of Nanofluids in Improving the Performance of Double-Pipe Heat Exchangers—A Critical Review

Experimental investigation on photothermal conversion using solar glycol/MWCNTs based nanofluids

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