Experimental investigation of heat transfer enhancement of a heat exchanger tube equipped with double-cut twisted tapes

Nakhchi, M.E.; Hatami, M.; Rahmati, Mohammad

doi:10.1016/j.applthermaleng.2020.115863

Cited by 70 publications

(12 citation statements)

References 34 publications

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“…Fluid flows are classified into three types: laminar, turbulent, and transitional, as shown in Figure 6. The Reynolds number has no dimensions and may be computed using the proper formula [34]. The dye was injected into the dye reservoir at the flow during this experiment in order to visualize the flow over time.…”

Section: Application Of Smart Mathematical Modelling Of Water Consumption With Periodic Time Osborne Reynolds Pipe Flowmentioning

confidence: 99%

Evaluating the Pressure and Loss Behavior in Water Pipes Using Smart Mathematical Modelling

Altowayti

Othman

Tajarudin

et al. 2021

Water

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Due to the constant need to enhance water supply sources, water operators are searching for solutions to maintain water quality through leakage protection. The capability to monitor the day-to-day water supply management is one of the most significant operational challenges for water companies. These companies are looking for ways to predict how to improve their supply operations in order to remain competitive, given the rising demand. This work focuses on the mathematical modeling of water flow and losses through leak openings in the smart pipe system. The research introduces smart mathematical models that water companies may use to predict water flow, losses, and performance, thereby allowing issues and challenges to be effectively managed. So far, most of the modeling work in water operations has been based on empirical data rather than mathematically described process relationships, which is addressed in this study. Moreover, partial submersion had a power relationship, but a total immersion was more likely to have a linear power relationship. It was discovered in the experiment that the laminar flows had Reynolds numbers smaller than 2000. However, when testing with transitional flows, Reynolds numbers were in the range of 2000 to 4000. Furthermore, tests with turbulent flow revealed that the Reynolds number was more than 4000. Consequently, the main loss in a 30 mm diameter pipe was 0.25 m, whereas it was 0.01 m in a 20 mm diameter pipe. However, the fitting pipe had a minor loss of 0.005 m, whereas the bending pipe had a loss of 0.015 m. Consequently, mathematical models are required to describe, forecast, and regulate the complex relationships between water flow and losses, which is a concept that water supply companies are familiar with. Therefore, these models can assist in designing and operating water processes, allowing for improved day-to-day performance management.

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Section: Application Of Smart Mathematical Modelling Of Water Consumption With Periodic Time Osborne Reynolds Pipe Flowmentioning

confidence: 99%

Evaluating the Pressure and Loss Behavior in Water Pipes Using Smart Mathematical Modelling

Altowayti

Othman

Tajarudin

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…From the ancient, many experiments and numerical approaches [22][23][24][25][26] were applied to insert the circular tubes as the tabulator creator or vortex generator to enhance the heat transfer in the rectangular channel in such a way a valuable heat exchanger can be made. Also, much literature [27][28][29] can be found that developed the correlations among the fluid dynamics parameter and the non-dimensional parameter which might help design the heat exchanger of any shape. Many of the researchers who had focused on the shape of the heat exchanger for example [30][31][32] have suggested that increasing the heat transfer in the tube dimpled channel proved to be the most beneficial in terms of transferring the heat than the plain tubes.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel

Memon¹,

Memon²,

Bhatti³

et al. 2022

Computers, Materials &Amp; Continua

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This article is intended to examine the fluid flow patterns and heat transfer in a rectangular channel embedded with three semi-circular cylinders comprised of steel at the boundaries. Such an organization is used to generate the heat exchangers with tube and shell because of the production of more turbulence due to zigzag path which is in favor of rapid heat transformation. Because of little maintenance, the heat exchanger of such type is extensively used. Here, we generate simulation of flow and heat transfer using nonisothermal flow interface in the Comsol multiphysics 5.4 which executes the Reynolds averaged Navier stokes equation (RANS) model of the turbulent flow together with heat equation. Simulation is tested with Prandtl number (Pr = 0.7) with inlet velocity magnitude in the range from 1 to 2 m/sec which generates the Reynolds number in the range of 2.2 × 10 5 to 4.4 × 10 5 with turbulence kinetic energy and the dissipation rate in ranges (3.75 × 10 −3 to 1.5 × 10 −2 ) and (3.73 × 10 −3 −3 × 10 −2 ) respectively. Two correlations available in the literature are used in order to check validity. The results are displayed through streamlines, surface plots, contour plots, isothermal lines, and graphs. It is concluded that by retaining such an arrangement a quick distribution of the temperature over the domain can be seen and also the velocity magnitude is increasing from 333.15% to a maximum of 514%. The temperature at the middle shows the consistency in value but declines immediately at the end. This process becomes faster with the decrease in inlet velocity magnitude.

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“…Not only does perforation enhance the turbulator efficiency, but turbulator-cutting or groove also enhances the effectiveness of the turbulator. In a recent experimental study, the effect of double-cut twisted tape on heat transfer improvements was considered by Nakhchi et al [20]. They found that by increasing the cut ratio from 0.25 to 0.90, the Nusselt number was enhanced up to 177.4%.…”

Section: Introductionmentioning

confidence: 99%

Effects of CuO nano powder on performance improvement and entropy production of double-pipe heat exchanger with innovative perforated turbulators

Nakhchi

Hatami

Rahmati

2021

Advanced Powder Technology

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Experimental investigation of heat transfer enhancement of a heat exchanger tube equipped with double-cut twisted tapes

Abstract: Experimental investigation of heat transfer enhancement of a heat exchanger tube equipped with double-cut twisted tapes. Applied Thermal Engineering, 180. p. 115863.

Cited by 70 publications

References 34 publications

Evaluating the Pressure and Loss Behavior in Water Pipes Using Smart Mathematical Modelling

Evaluating the Pressure and Loss Behavior in Water Pipes Using Smart Mathematical Modelling

Simulation of Non-Isothermal Turbulent Flows Through Circular Rings of Steel

Effects of CuO nano powder on performance improvement and entropy production of double-pipe heat exchanger with innovative perforated turbulators

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