A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz, Emine Yağız; Sözen, Adnan; Variyenli, Halil İbrahim; Khanları, Ataollah; Tuncer, Azim Doğuş

doi:10.1007/s40430-020-02601-1

Cited by 49 publications

(19 citation statements)

References 52 publications

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“…Tiwari et al (2014) performed CFD based analysis using corrugated PHE to validate the experimental data for different concentrations, temperatures and flow rates by considering CeO 2 /water nanofluids as single phase homogeneous mixture. Gürbüz et al (2020a) reported experimental study to improve thermal efficiency of PHE by improving thermal performance of conventional fluid and varying the number of plates. They observed enhancement in OHTC and effectiveness of PHE by 20% and 16%, Compact plate heat exchanger respectively, for 16 plates.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of performance in a compact plate heat exchanger using graphene oxide/water nanofluid

Singh

Verma

Ghosh

2021

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Purpose This study aims to present the experimental and computational performance analysis in compact plate heat exchanger (PHE) using graphene oxide nanofluids at different concentrations and flow rate. Design/methodology/approach Field emission scanning electron microscope and X-ray diffraction were used to characterize graphene oxide nanoparticles. The nanofluid samples were prepared by varying volume concentration. Zeta potential test was done to check stability of samples. The thermophysical properties of samples have been experimentally measured. The experimental setup of PHE with 60° chevron angle has also been developed. The numerical analysis is done using computational fluid dynamics (CFD) model having similar geometry as of the actual plate. Distilled water at fixed temperature and flow rate is used in hot side tank. Nanofluid at fixed temperature with varying concentration and flow rate is used in cold side tank as coolant. Findings The numerical and experimental results were compared and found that both results were in good agreement. The results showed ∼13% improvement in thermal conductivity, ∼14% heat transfer rate (HTR), ∼9% in effectiveness and ∼10% in overall heat transfer coefficient at cost of pressure drop and pumping power using nanofluid. Exergy loss also decreased using nanofluid at optimum concentration of 1 Vol.%. Originality/value The CFD model can be significant to analyze temperature, pressure and flow distribution in heat exchanger which is impossible otherwise. This study gives ease to predict PHE performance with high accuracy without performing the experiment.

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of performance in a compact plate heat exchanger using graphene oxide/water nanofluid

Singh

Verma

Ghosh

2021

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“…Each channel in the PHEs has an equivalent flow area. The following equations can be used for obtaining wetted perimeter (Gürbüz et al, 2020):…”

Section: Plate Heat Exchangermentioning

confidence: 99%

“…In some studies, TiO 2 and Al 2 O 3 containing single nanofluids numerically and experimentally were investigated. In addition, during recent years, hybrid-type nanofluids are used to attain superior thermal efficiency(Gürbüz et al, 2020). In the present work, TiO 2 and Al 2 O 3 have been used to produce TiO 2 -Al 2 O 3 /water hybrid nanofluid.…”

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confidence: 99%

A comprehensive survey on utilization of hybrid nanofluid in plate heat exchanger with various number of plates

Afshari

Tuncer

Sözen

et al. 2021

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Purpose Using suspended nanoparticles in the base fluid is known as one of the most efficient ways for heat transfer augmentation and improving the thermal efficiency of various heat exchangers. Different types of nanofluids are available and used in different applications. The main purpose of this study is to investigate the effects of using hybrid nanofluid and number of plates on the performance of plate heat exchanger. In this study, TiO2/water single nanofluid and TiO2-Al2O3/water hybrid nanofluid with 1% particle weight ratio have been used to prepare hybrid nanofluid to use in plate type heat exchangers with three various number of plates including 8, 12 and 16. Design/methodology/approach The experiments have been conducted with the aim of examining the impact of plates number and used nanofluids on heat transfer enhancement. The performance tests have been done at 40°C, 45°C, 50°C and 55°C set outlet temperatures and in five various Reynolds numbers between 1,600 and 3,800. Also, numerical simulation has been applied to verify the heat and flow behavior inside the heat exchangers. Findings The results indicated that using both nanofluids raised the thermal performance of all tested exchangers which have a various number of plates. While the major outcomes of this study showed that TiO2-Al2O3/water hybrid nanofluid has priority when compared to TiO2/water single type nanofluid. Utilization of TiO2-Al2O3/water nanofluid led to obtaining an average improvement of 7.5%, 9.6% and 12.3% in heat transfer of heat exchangers with 8, 12 and 16 plates, respectively. Originality/value In the present work, experimental and numerical analyzes have been conducted to investigate the influence of using TiO2-Al2O3/water hybrid nanofluid in various plate heat exchangers. The attained findings showed successful utilization of TiO2-Al2O3/water nanofluid. Based on the obtained results increasing the number of plates in the heat exchanger caused to obtain more increment by using both types of nanofluids.

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“…Khanlari, Sözen, and Variyenli (2019) reported that using TiO 2 /water nanofluids improved the mean overall heat transfer coefficient in PHE by 6–10%. Similarly, Gürbüz, Sözen, Variyenli, Khanlari, and Tuncer (2020) used Al 2 O 3 ‐CuO/water hybrid nanofluid to enhance the thermal efficiency of heat exchangers. The highest increment in overall heat transfer coefficient was obtained as 12, 19, and 20% in PHEs with 8, 12, and 16 plates, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Gürbüz, Sözen, Variyenli, Khanlari, and Tuncer (2020) used Al 2 O 3 -CuO/water hybrid nanofluid to enhance the thermal efficiency of heat exchangers. The highest increment in overall heat transfer coefficient was obtained as 12, 19, and 20% in PHEs with 8, 12, and 16 plates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of fouling during milk processing in polytetrafluoroethylene‐titanium dioxide coated plate heat exchanger

Munivenkatappa

Franklin

Dhotre

et al. 2021

J Food Process Engineering

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An attempt was made to mitigate fouling during milk processing in plate heat exchanger by modifying SS316 surface with the coating of polytetrafluoroethylene (PTFE) and titanium dioxide (TiO 2 ) nanoparticles. The surface characteristics of PTFE-TiO 2 coated and conventional SS316 plates, and their thermal performance during heating of milk in batches for 8 hr were compared. It was observed that the static contact angles of water on SS316 and PTFE-TiO 2 coated plates were 66.8 ± 6.3 and 112.8 ± 0.8 , while for milk they were 61.0 ± 6.1 and 97.5 ± 1.1 , respectively. The increase in contact angle for coated surface was suggestive of weaker interaction between the fluid and surface, and enhancement in hydrophobicity. Overall heat transfer coefficients for uncoated and coated plates ranged from 354.36 to 952.26 Wm À2 K À1 and 477.11 to 593.73 Wm À2 K À1 , whereas the fouling factor was 1.723 Â 10 À3 and 0.412 Â 10 À3 m 2 KW À1 , respectively. As deposition of foulants occurred, the overall heat transfer coefficient of SS316 and coated surfaces dropped by 62.15 and 19.40%, respectively, from the initial value, resulting in crossover of the curves at 310 min of heating milk. After 480 min of heating milk, the fouling factor of SS316 plates was at least four times higher than that of PTFE-TiO 2 coated plates.The PTFE-TiO 2 coating mitigated the deposition of milk foulants by 20 times than that of SS316 surface. Practical ApplicationsFouling of plate heat exchangers (PHE) during milk processing is an unsolved problem causing significant loss in heat transfer performance, increased pressure drop in flow between plates, loss of process time due to cleaning and impairment of product quality. The high surface free energy and hydrophilic adhesion of SS316 to milk act as stimulants to fouling. Modification of SS316 plates in PHE with coating of polytetrafluroethylene and titanium dioxide nanoparticles mitigates fouling. Coated plates maintain the heat transfer performance of the plates for extended time and reduce the cleaning requirement. Also, savings in harsh chemicals, water, and pumping costs could be realized.

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A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Cited by 49 publications

References 52 publications

Numerical and experimental analysis of performance in a compact plate heat exchanger using graphene oxide/water nanofluid

Numerical and experimental analysis of performance in a compact plate heat exchanger using graphene oxide/water nanofluid

A comprehensive survey on utilization of hybrid nanofluid in plate heat exchanger with various number of plates

Mitigation of fouling during milk processing in polytetrafluoroethylene‐titanium dioxide coated plate heat exchanger

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