Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Arani, Ali Akbar Abbasian; Memarzadeh, Ali

doi:10.1108/hff-02-2021-0125

Cited by 6 publications

(2 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thermal device is thus contrived compactly and powerfully to deliver the desired thermal capacity. Crucial techniques for improving thermal performance include the active mechanism necessitating the additional power unit and the passive one, such as the twisted ribbon inserts not necessitating another supplemental one (Arani and Memarzadch, 2022; Mashayekhi et al , 2022). Contriving an original twisted ribbon to insert the round tubes inside a heat exchanger is thus beneficial for thermal science and is explicitly examined in this work.…”

Section: Introductionmentioning

confidence: 99%

Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes

Perng,

Wu,

Huang

2024

HFF

View full text Add to dashboard Cite

Purpose The purpose of this study is to advance turbulent thermal convection inside the constant heat-flux round tube inserted by multiple perforated twisted tapes. Design/methodology/approach The novel design of this study is accomplished by inserting several twisted tapes and drilling some circular perforations near the tape edge (C1, C3, C5: solid tapes; C2, C4, C6: perforated tapes). The turbulence flow appearances and thermal convective features are examined for various Reynolds numbers (8,000–14,000) using the renormalization group (RNG) κ−ε turbulent model and Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm. Findings The simulated outcomes reveal that inserting more perforated-twisted tapes into the heated round tube promotes turbulent thermal convection effectively. A swirling flow caused by the twisted tapes to produce the secondary flow jets between two reverse-spin tapes can combine with the main flow passing through the perforations at the outer edge to enhance the vortex flow. The primary factors are the quantity of twisted tapes and with/without perforations, as the perforation ratio remains at 2.5 in this numerical work. Weighing friction along the tube, C6 (four reverse-spin perforated-twisted tapes) brings the uppermost thermal-hydraulic performance of 1.23 under Re = 8,000. Research limitations/implications The constant thermo-hydraulic attributes of liquid water and the steady Newtonian fluid are research limitations for this simulated work. Practical implications The simulated outcomes will avail the inner-pipe design of a heat exchanger inserted by multiple perforated twisted tapes to enhance superior heat transfer. Originality/value These twisted tapes form tiny circular perforations along the tape edge to introduce the fluid flow through these bores and combine with the secondary flow induced between two reverse-spin tapes. This scheme enhances the swirling flow, turbulence intensity and fluid mixing to advance thermal convection since larger perforations cannot produce large jet velocity or the position of perforations is too far from the tape edge to generate a separated flow. Consequently, this work contributes a valuable cooling mechanism toward thermal engineering.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes

Perng,

Wu,

Huang

2024

HFF

View full text Add to dashboard Cite

show abstract

“…A wavy tube with a sinusoidal wavy wall can be assumed as a smoothed version of a corrugated pipe to reduce the pressure loss due to its grooves. Several practical applications of corrugated and wavy tubes are reported in industrial heat exchangers, including chemical reactors, paint manufacturing, the food industries, marine and pharmaceuticals (Abbasian Arani and Memarzadeh, 2022; Saha et al , 2015; Li et al , 2023a). Fluid flow inside corrugated and wavy pipes is characterized by complex interactions between free shear layers, separated vortices and driving wall-bounded shear flow, which may increase the rate of heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Abbaszadeh,

Montazeri,

Mirzaie

2023

HFF

View full text Add to dashboard Cite

Purpose The purpose of the study is to propose a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance the rate of heat transfer without compromising thermal efficiency. The study numerically investigates the fluid flow characteristics and analyzes the effect of different geometrical configurations, including wall wave amplitude, tape twist angles and nanoparticle volume fractions, on heat transfer improvement and performance factor. Design/methodology/approach This problem is numerically investigated using computational fluid dynamics, and the method is the finite volume method. A two-phase mixture model is used for nanofluid modeling. Findings The study investigated the effect of wall waviness, twisted tape, and nanoparticles on forced convective heat transfer and friction factor behavior in laminar pipe flow in three different Reynolds number regimes. The results showed that implementing twisted tape in wavy tubes significantly increased the rate of heat transfer and the performance factor, with the best twist ratio between 90 and 180°. Adding nanoparticles also enhanced heat transfer and performance factor, but to a lesser extent than wavy wall-twisted tape combinations. The study suggests selecting a proper combination of wavy wall and twisted tape at each Reynolds number to achieve an optimum solution. Originality/value To the best of the authors’ knowledge, the implementation of the selected passive methods in sinusoidal wavy tubes has not been studied before, and no previous studies have taken into account such a mix of heat transfer improvement techniques.

show abstract

Entropy generation analysis and thermal performance of absorber tube in parabolic trough solar collector inserted with eccentric structure insert

Wang,

Zeng,

Zhao

et al. 2024

Renewable Energy

View full text Add to dashboard Cite

Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Cited by 6 publications

References 45 publications

Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes

Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Entropy generation analysis and thermal performance of absorber tube in parabolic trough solar collector inserted with eccentric structure insert

Contact Info

Product

Resources

About