Flow boiling heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tapes

Sarmadian, Alireza; Moghaddam, Hadi Ahmadi; Asnaashari, Amirmasoud; Joushani, Hossein Ahmadi Nejad; Moosavi, Mohammad Reza; Islam, Mohammad S.; Saha, Suvash C.; Shafaee, Maziar

doi:10.1016/j.ijheatmasstransfer.2020.120345

Cited by 11 publications

(4 citation statements)

References 32 publications

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“…Such twisted ribbons have attracted research attention in recent years due to their high thermal performance and compact structure, with ease of manufacture in different sizes, shapes and suitability for the types of flow [37][38]. The primary goal of these investigations was to enhance eddy currents and convective heat transfer by altering the geometry of the twisted ribbons, as well as higher liquid mixing in round tubes and heat exchangers.…”

Section: Twisted Tape Insertmentioning

confidence: 99%

“…A higher increasing for the Nu number and pressure drop were 35%, 81%, respectively. Liu et al [73] analyzed the influences of twisted tapes on flow parameters on DNB-type CHF numerically have been using Euler's multiphase model and a FLUENT-based critical heat flow boiling model on tubes with and without twisted ribbon layers. The simulation results showed that the DNB-type CHF is evaluated to be proportional to the mass flux, and also showed that the pressure drop increases with increasing bandwidth ratio and mass flux, but increases with decreasing twist ratio.…”

Section: -2-1-2 Two-phase Flow With An Insert Of Twisted Tapementioning

confidence: 99%

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A Review Study on Modifying Vortex Generators to Improve Thermal Performance in Single- and Two-Phase Flow in Circular Tubes

Alnasur,

AL-Turaihi

2024

Engineering Headway

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The literature about various modifications to the vortex generators as passive techniques and some combined techniques was discussed numerically and experimentally. In general, all vortex generators have a good coefficient of thermal performance compared to a plain tube. Most vortex generators don’t consume any amount of energy to perform their function, so can be considered a good tool to enhance the thermal performance coefficient in industrial applications, but they have the disadvantage of high pressure drop. When using vortex generators in two phase flow accelerated the process of transition between phases pattern in addition to increasing heat transfer. The inserted twisted tapes have a low pressure drop and good heat transfer efficiency, resulting in a thermal performance factor of 1.6.In addition, the easier to manufacture where can be changed in size and shape in proportion to the place of use inside the tubes also having a low cost, and do not consume any amount of energy to perform its function, the hybrid methods can be used with it, such as a twisted tape with nonfluids, which had proven effective in thermal performance coefficients, but their disadvantages include the high cost and risk of dealing with these materials ,bubble injectors can also be used, despite the fact that they require energy to operate. So, the twisted tapes inserted can be considered a best tool to be used in enhancing the thermal performance coefficient in various Industrial fields.Based on the reviewed literature, it was determined that the following research is limited and could garner more attention in the future: multiple coaxial cross-twisted tapes with different perforations, and twisted tapes with variable cross-section, typical twisted tapes with regular wavy edge, hybrid methods such as nanofluids and twisted tape can be used in multiphase flow.

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Section: Twisted Tape Insertmentioning

confidence: 99%

Section: -2-1-2 Two-phase Flow With An Insert Of Twisted Tapementioning

confidence: 99%

A Review Study on Modifying Vortex Generators to Improve Thermal Performance in Single- and Two-Phase Flow in Circular Tubes

Alnasur,

AL-Turaihi

2024

Engineering Headway

View full text Add to dashboard Cite

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“…We propose two empirical relations to describe the convective heat transfer coefficient and friction factor. Sarmadian et al (2020) investigated the heat transfer characteristics in a heat exchanger and discussed the heat transfer improved by twisted tapes. The channel heat transfer performance and pressure drop improved with the installation of the twisted tapes.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics and Pressure Drop of U-type Channel in Vacuum Distillation Process for Titanium Sponge

et al. 2022

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Blockage of the U-type channel exacerbates the intermittency of production, and clarifying the channel heat transfer characteristics and pressure drop is an effective way to address this problem. The channel heat transfer and flow characteristics of the fluid in the channel are experimentally investigated in this study. According to the experiments, the heat transfer coefficient is between 59.95 and 200.29 W/m2⋅K and increases with the flow velocity and fluid temperature. Because the pressure drop is usually accompanied by a change in the energy loss of the fluid, the energy loss is evaluated experimentally. The results demonstrate that the friction loss in the straight tube section accounts for 80% of the energy loss. A bent tube of 90° is recommended instead of a right-angle tube to reduce the pressure drop. A dimensionless relation regarding the Nusselt number is presented to predict the heat transfer characteristics. We provided proposals to address the problem of blockage of the U-type channel, this is helpful to reduce production energy consumption and improve the quality of titanium sponge.

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“…Sarmadian et al [12] investigated the boiling heat transfer characteristics of the refrigerant isobutane (R600a). The tests were taken on a horizontal copper pipe with a length of 1000 mm and an internal diameter of 8.1 mm, in addition to the twisted interior tapes with torsion ratios of 4, 10 and 15, mass velocities of 160 to 350 kg•m -2 •s -1 and vapor qualities 0.1 to 0.8.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Correlations of Flow Boiling Heat Transfer of R600a in a Flat-Plate Solar Collector/Evaporator

Quitiaquez¹,

Anchapaxi²,

Cortez³

et al. 2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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In the current research work, the behavior of the boiling heat transfer coefficient in a flat-plate solar collector/evaporator, component of a direct-expansion solar-assisted heat pump (DX-SAHP) was studied using a hydrocarbon refrigerant with zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). The main dimensions of the collector/evaporator are 0.8, 3.8, and 1000 mm of the fin thickness, internal diameter, and length, respectively. Five experimental tests were realized at different times of the day for obtaining the results, with mass velocities varying between 197.59 and 267.26 kg•m -2 •s -1 , and the heat flux having values between 72.83 and 488.27 W•m -2 . The operating values in tests, such as refrigerant pressure and temperature, were taken in a built prototype. The numerical analysis was carried out considering different correlations proposed by Chen, Wojtan, and Kattan. The Wojtan mathematical model offered the best projection of the heat transfer effect for the different transition zones of a two-phase flow along the pipeline. The boiling heat transfer coefficients had approximate maximum values of 8.2, 8.5, 7.8, 6.7, and 5.8 kW•m -2 •K -1 for the A, B, C, D, and E tests prediction by Wojtan. Moreover, the boiling heat transfer coefficients increased as the mass velocity enhanced and the rise of vapor quality as the mass velocity was fixed. In this study, the effect of solar radiation, vapor quality on the measured heat transfer coefficient was analyzed.

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Flow boiling heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tapes

Cited by 11 publications

References 32 publications

A Review Study on Modifying Vortex Generators to Improve Thermal Performance in Single- and Two-Phase Flow in Circular Tubes

A Review Study on Modifying Vortex Generators to Improve Thermal Performance in Single- and Two-Phase Flow in Circular Tubes

Heat Transfer Characteristics and Pressure Drop of U-type Channel in Vacuum Distillation Process for Titanium Sponge

Evaluation of Correlations of Flow Boiling Heat Transfer of R600a in a Flat-Plate Solar Collector/Evaporator

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