Experimental study on the heat transfer and flow characteristics of nanofluids in the built-in twisted belt external thread tubes

The heat transfer and flow characteristics of water in a copper foam tube, a nickel foam tube, and a smooth tube are investigated in this paper. The copper foam tube and nickel foam tube are produced, and an experiment for testing the heat transfer and flow characteristics of water in metal foam tubes is set up. Experimental system validation is done in this paper, and it is found that the experimental results have a good agreement with that of published literature. The effects of two kinds of metal foam tubes and different Reynolds numbers on the heat transfer and flow characteristics of water are investigated. It is found that copper foam tube shows the best heat transfer performance, followed by the nickel foam tube, and the smooth tube has the worst heat transfer performance. It is also found that comprehensive index of heat transfer and flow increases with Reynolds number.

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“…The equation of comprehensive evaluation between heat transfer and flow resistance, ς, is shown [19]:…”

Section: Data Processingmentioning

confidence: 99%

Experimental study on heat transfer and flow characteristics of two kinds of porous metal foam tubes filled with water

Wang

Pan

et al. 2018

THERM SCI

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“…Sun et al conducted research to examine the heat transfer characteristics on diverse types of Nanofluids such as copper, graphite, and aluminum by using twisted tubes with external threads. The experimental results displayed improvement in the heat transfer rate by 50.32% compared to conventional tubes.…”

Section: Introductionmentioning

confidence: 99%

“…14 Twisted tubes, twisted channels, and twisted oval tubes create swirl flow at low Reynolds number, which enhances the coefficient of heat transfer. 15 Sun et al 16 conducted research to examine the heat transfer characteristics on diverse types of Nanofluids such as copper, graphite, and aluminum by using twisted tubes with external threads. The experimental results displayed improvement in the heat transfer rate by 50.32% compared to conventional tubes.…”

Section: Introductionmentioning

confidence: 99%

Indirect thermosiphon flat‐plate solar collector performance based on twisted tube design heat exchanger filled with nanofluid

2020

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Summary Stationary solar collector such as flat‐plate collector is a thermal device, which traps solar energy and converts it into heat that can be used in industrial and domestic applications such as water heating. Flat‐plate collector thermal performance enhancement is investigated in this research paper. Two cross‐sectional geometries of the tube in the heat exchanger were investigated; a normal circular tube and a twisted tube were used in the experiment. The aim of the twisted tube exchanger is to enhance the performance of heat transfer of the tubes and to reduce the shell pressure drop; flat‐plate solar collector is the used application to study the heat exchanger performance. Both twisted tubes heat exchanger and normal circular tubes heat exchanger were examined in the same location and conditions with the same solar collector, both were used in the heat exchanger to study their effect, with two different working fluids, which are distilled water and multiwalled carbon nanotube (MWCNT)/water nanofluid. The system shows an increase in the performance when twisted tubes were used in the system compared with the circular tubes in both distilled water and MWCNT/water nanofluid by 12.8% and 12.5%, respectively, with an improvement by 34% for twisted tubes with MWCNT compared with normal circular tubes with distilled water.

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“…Further, nanofluids have also been used with other enhancing devices for the heat transfer process, such as wire coils, twisted tape and roughened heat exchanger surfaces [9][10][11][12][13]. Recently, the combination of nanofluid, inserts and roughened heat exchanger surfaces has been reported [14,15]. Although nanofluids can improve heat transfer inside a tube at a low particle volume fraction, they have some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Turbulent Convective Heat Transfer using a Microparticle Multiphase Flow

2020

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The turbulent heat transfer enhancement of microfluid as a heat transfer medium in a tube was investigated. Within the Reynolds number ranging from 7000 to 23,000, heat transfer, friction loss and thermal performance characteristics of graphite, Al2O3 and CuO microfluid with the particle volume fraction of 0.25%–1.0% and particle size of 5 μm have been respectively tested. The results showed that the thermal performance of microfluids was better than water. In addition, the graphite microfluid had the best turbulent convective heat transfer effect among several microfluids. To further investigate the effect of graphite particle size on thermal performance, the heat transfer characteristics of the graphite microfluid with the size of 1 μm was also tested. The results showed that the thermal performance of the particle size of 1 μm was better than that of 5 μm. Within the investigated range, the maximum value of the thermal performance of graphite microfluid was found at a 1.0% volume fraction, a Reynolds number around 7500 and a size of 1 μm. In addition, the simulation results showed that the increase of equivalent thermal conductivity of the microfluid and the turbulent kinetic energy near the tube wall, by adding the microparticles, caused the enhancement of heat transfer; therefore, the microfluid can be potentially used to enhance turbulent convective heat transfer.

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Experimental study on the heat transfer and flow characteristics of nanofluids in the built-in twisted belt external thread tubes

Cited by 54 publications

References 29 publications

Experimental study on heat transfer and flow characteristics of two kinds of porous metal foam tubes filled with water

Experimental study on heat transfer and flow characteristics of two kinds of porous metal foam tubes filled with water

Indirect thermosiphon flat‐plate solar collector performance based on twisted tube design heat exchanger filled with nanofluid

Enhancement of Turbulent Convective Heat Transfer using a Microparticle Multiphase Flow

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