Turbulent convective heat transfer of silica oxide nanofluid through corrugated channels: An experimental and numerical study

Ajeel, Raheem K.; Salim, Wan Saiful Islam Wan; Sopian, Kamaruzzaman; Yusoff, Mohd Zamri; Hasnan, Khalid; Ibrahim, Adnan; Al‐Waeli, Ali H.A.

doi:10.1016/j.ijheatmasstransfer.2019.118806

Cited by 99 publications

(18 citation statements)

References 30 publications

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“…Other than inserts, having corrugated channel instead of smooth channel can create better fluid mixing of the working fluid. Raheem et al 109 found out that trapezoidal-corrugated give highest enhancement ratio compared to semicircle and straight channel. Hence, another venture into these design with inserts is needed in order to create higher efficiency heat transfer system.…”

Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Ahmad

Abdullah

Sopian

2014

Advances in Mechanical Engineering

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Working fluid with higher thermal conductivity and tube with better fluid mixing are two crucial elements for heat transfer enhancement in heat exchanger system. Hence, several methods and techniques have been explored to improve heat transfer efficiency, including dispersing nanoparticles into conventional heat transfer fluid and inserting instruments inside the tube of the heat exchanger. Studies have shown that nanofluid can improve heat transfer efficiency of the system due to its higher thermal conductivity and drastic Brownian motion of nanoparticles while inserts within tube can improve heat transfer efficiency by increasing axial velocity of working fluid for better fluid mixing. This article summarized 109 of journals from recent research on heat transfer enhancement of nanofluid flowing inside the tube with inserts as well as discussing the significant parameters that affected the system’s efficiency such as nanoparticles’ volume fraction, Reynolds number and types and configurations of inserts. Ultimately, analysis will be carried out to determine the most suitable modification of twisted tape inserts with the most optimum value of nanoparticle volume fraction for turbulence flow regime. Finally, some problems that need to be solved for future research such as agglomeration and pressure drop are discussed.

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Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Ahmad

Abdullah

Sopian

2014

Advances in Mechanical Engineering

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“…Furthermore, it was found that the Nusselt number decreased with increasing the wavelength, while the pressure drops increased. Ajeel et al [23][24][25][26][27][28][29][30][31][32] numerically examined the effects of various parameter designs of a corrugated channel on the thermal hydraulic performance under different Reynolds number ranges. In [23], the effects of various parameter design on the thermal hydraulic performance of the corrugated channel were studied.…”

Section: Numerical Studiesmentioning

confidence: 99%

“…View of computational model and channels shapes [27] The results indicated that the pressure drop and heat transfer were enhanced with increasing the Reynolds number. In [28] and [29] and [30], the impact of the corrugated surfaces shape on the thermal hydraulic characteristics of the corrugated channels were numerically investigated. Figure 19 shows the velocity contours, temperature contours, turbulent kinetic energy and vortices contours at Reynolds number of 10,000, for various corrugation channels.…”

Section: Numerical Studiesmentioning

confidence: 99%

Augmentation of Fluid Flow and Heat Transfer Characteristics in corrugated Channel: A Review Study

Jaffal

Al‐Obaidi

Ghani

2021

DJES

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The corrugation configuration played an important role in heat transfer enhancement in many engineering applications such as heat exchangers, microchannel heat sink, solar collectors, etc. The significance of the corrugation configuration is manifested in its ability to offer a larger heat transfer area more than a straight channel. Besides, the periodic interruption and redeveloping of the thermal boundary layer which is an important feature offered by corrugation is remarkably enhanced the heat transfer. The researchers were keen to take advantage of these features and develop them by manipulating geometrical parameters to obtain the optimal results. The current work aims to collect available research data, which focused on improving heat transfer in corrugated channels and identifying the most important factors affecting the performance of corrugated channels. Among the studied shapes of the various operating conditions of the corrugated channels, the researchers unanimously agreed that the trapezoidal shape of the corrugations gives the best thermal improvement with a reasonable pressure drop inside the channels.

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“…Thus, increasing Nu and reducing ∆P are highly important for the realization of a higher performance heat exchanger. An approach for increasing the thermal performance of a thermal system is to adopt a passive method, such as alteration of the fluid flow inside a tube including having a corrugated channel/tube or using insert inside the channel/tube [1,2]. Therefore, several modifications have been made to the twisted tape by researchers to produce better fluid mixing with lower ∆P including serrated twisted tape (TPP) [3], multiple twisted tape [4], square and V-cut twisted tape [5], segmented twisted tape [6], and self-rotating twisted tape [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of the Thermal Performances of SiC/Water and Al2O3/Water Nanofluid Inside a Circular Tube with Constant-Increased-PR Twisted Tape

2020

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The simultaneous use of two passive methods (twisted tape and a nanofluid) in a heat transfer system will increase the average Nusselt number (Nu) of the system. However, the presence of inserts and nanoparticles inside the tube will create higher pressure drop (ΔP) in the system, which can eventually affect the overall enhancement ratio (η), especially at higher Reynolds numbers (Re). Several modifications of twisted tapes have been made to reduce ΔP, but most showed a decreasing trend of η as Re increased. The objective of this study is to design a new geometry of twisted tape that yields a larger value of Nu and a smaller value of ΔP, which can result in a larger value of η especially at higher Re. A simulation and experimental analysis are conducted in which Re ranges from 4000–16,000 with two types of nanofluids (SiC/Water and Al2O3/Water) at various values of the volume fraction, (φ) (1–3%). ANSYS FLUENT software with the RNG k-ɛ turbulent model is adopted for the simulation analysis. Three types of twisted tape are used in the analysis: classic twisted tape with a pitch ratio of 2 (TT PR2), constant-increasing-pitch-ratio twisted tape (TT IPR) and constant-decreasing-pitch-ratio twisted tape (TT DPR). The use of TT IPR generates a stronger swirling flow at the inlet of the tube and smaller ∆P, especially near the outlet region. The highest value of η is obtained for 3% SiC/Water nanofluid that is flowing through a smooth circular tube with TT IPR inserts at Re of 10,000.

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Turbulent convective heat transfer of silica oxide nanofluid through corrugated channels: An experimental and numerical study

Cited by 99 publications

References 30 publications

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Augmentation of Fluid Flow and Heat Transfer Characteristics in corrugated Channel: A Review Study

Numerical and Experimental Analysis of the Thermal Performances of SiC/Water and Al2O3/Water Nanofluid Inside a Circular Tube with Constant-Increased-PR Twisted Tape

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