Heat transfer intensification of turbulent forced convection by inserting discontinuous twisted tapes in a wavy tube; hydrothermal and thermodynamics analysis

Fazel, Zeinab; Sadrhosseini, Hani; Hannani, Siamak Kazemzadeh

doi:10.1016/j.cep.2022.109137

Cited by 9 publications

(3 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This latter suggests that an increase in twist angle results in a dominant secondary flow, which, in turn, leads to an elimination of circulation regions so that the fluid is allowed to circulate completely. This is in good agreement with some results previously reported in the literature [60][61][62].…”

Section: Effect Of the Geometrical Factorssupporting

confidence: 94%

Exploring the Bioenergy Potential of Microfluidics: The Case of a T-Micromixer with Helical Elements for Sustainable Energy Solutions

Mahammedi,

Tayeb,

Rahmani

et al. 2023

Energies

View full text Add to dashboard Cite

This study explores the potential application of microfluidics in the field of bioenergy, with a particular focus on the energy potential of biogas derived from vine shoots, a locally abundant waste material. The enhanced mixing capability of a micromixer has been analyzed to make it suitable for microfluidic energy applications. Mixing index, pressure drop, and kinematic measurements within the T-micromixer with helical elements and their related mixing performances have been studied and validated using CFD for different values of Reynolds number (0.1–60) for laminar Newtonian miscible fluid. Geometrical characteristics were further examined to improve the mixing performance. Various values of twisted angles were evaluated and compared to choose the optimal angle. A new parameter, Q, was introduced to represent the ratio of vorticity square over the sum of vorticity square and deformation square intensities. Furthermore, the results of the numerical simulation were compared with the given data in the literature, showing a significant agreement, in addition to the fact that a high-quality mixture can be created with a geometry angle of 90°, and a mixing index above 0.99 can be obtained at low Reynolds numbers. The numerical investigation of the flow regimes of miscible fluid in the T-microkenics with the proposed angle can be utilized to develop the mixing performance of the micromixers in a wide variety of processes.

show abstract

Section: Effect Of the Geometrical Factorssupporting

confidence: 94%

Exploring the Bioenergy Potential of Microfluidics: The Case of a T-Micromixer with Helical Elements for Sustainable Energy Solutions

Mahammedi,

Tayeb,

Rahmani

et al. 2023

Energies

View full text Add to dashboard Cite

show abstract

“…The relationships that were used to find the Nusselt of the plain tube for verification are given by Eqs. ( 17) and (18).…”

Section: Impact Of the Number Of Holes On The Thermal Behavior Of The...mentioning

confidence: 99%

“…When comparing Nusselt numbers and friction factors concerning Reynolds numbers, the test data revealed a 15%-24% increase in Nusselt numbers and a 12%-22% growth in friction factor compared to the Plain tube. Fazel et al [18] used a wavy passage with twisted tape installed to conduct a numerical study. The simulation was carried out by changing Re No.…”

mentioning

confidence: 99%

Tubular Heat Enhancement Using Twisted Tape Inserts with Large Holes

Abdulhamed,

Al-Akam,

Khudhayer

et al. 2024

ENERGY

View full text Add to dashboard Cite

Heat augmentation techniques play a vital role in the heating and cooling processes in industries, including solar collectors and many applications that utilize heat exchangers. Several studies are based on inserting fillers inside the tubes to enhance heat transfer. This investigation considered the effects of twisted tapes with large holes on a tubular heat exchanger's (HX) heat transmission, pressure drop, and thermal boosting factor. In the experimental section, counter-swirl flow generators used twisted tapes with pairs of 1.0 cm-diameter holes and changes in porosity (R p ) at 1.30% and 2.70%. In the experiments, air was utilized as a working fluid in a tube with a circular cross-section. The turbulent flow was considered, with Reynolds numbers (Re) domain from 4800 to 9500, and a boundary condition with a uniform wall heat flux was constructed. The findings expound that when the number of holes rose, the Nusselt number (Nu), the factor of friction (f ), and the thermal enhancement factor (η) all increased as well. Additionally, as the friction factor increased, the Nusselt number of the tape-equipped tube was noticeably higher. Additionally, it was discovered that the friction factor was between 70% and 94% lower than the values of the tube without tape, while the (Nu) was between 87% and 97% higher than the conventional tube values. The maximum value of η is 89%. According to the experimental results, empirical correlations for Nu, f, and η were also generated.

show abstract

Characterization of thermal-hydraulics in wavy solar power plant: effect of thermal dispersion

2023

View full text Add to dashboard Cite

Heat transfer intensification of turbulent forced convection by inserting discontinuous twisted tapes in a wavy tube; hydrothermal and thermodynamics analysis

Cited by 9 publications

References 58 publications

Exploring the Bioenergy Potential of Microfluidics: The Case of a T-Micromixer with Helical Elements for Sustainable Energy Solutions

Exploring the Bioenergy Potential of Microfluidics: The Case of a T-Micromixer with Helical Elements for Sustainable Energy Solutions

Tubular Heat Enhancement Using Twisted Tape Inserts with Large Holes

Characterization of thermal-hydraulics in wavy solar power plant: effect of thermal dispersion

Contact Info

Product

Resources

About