Numerical and experimental study of a shell and tube heat exchanger for different baffles

Kaleru, Aparna; Venkatesh, Sriram; Kumar, Narasimha

doi:10.1002/htj.22780

Cited by 9 publications

(5 citation statements)

References 40 publications

(90 reference statements)

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“…And the effect of volume flow rate on HT is more at high rates and vice versa. Aparna et al 17 They also observed that as the inclined angle increases up to 30°, the performance evaluation criterion (PEC) remains constant, and PEC decreases with further increasing angle. Liu et al 19 experimentally studied the forced convection and HT in non-Newtonian two-phase ethyleneglycol/H 2 O nanofluid through a wavy-sinusoidal in turbulent flow with uniform temperature.…”

Section: Nanofluidsmentioning

confidence: 93%

“…And the effect of volume flow rate on HT is more at high rates and vice versa. Aparna et al 17 experimentally and numerically studied the STHX by varying shell side fluid mass flow rate using the TEMA standard and found the Colburn factor for different helical baffles (20°, 30°, 40°, and 50°).…”

Section: Literaturementioning

confidence: 99%

“…Reynolds number 17

{\text{Re}}\,=\frac{\rho v{d}_{i}}{\mu },

where, ρ , v , and μ , are the velocity, density, and viscosity of the fluid respectively.…”

Section: Data Reductionmentioning

confidence: 99%

“…Dynamic viscosity given by Einstein is 17

{\mu }_{nf}=\frac{{\mu }_{b}}{{(1-\varphi )}^{2.5}}.

…”

Section: Data Reductionmentioning

confidence: 99%

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Augmentation of heat transfer through passive techniques

Nitturi,

Kapu,

Gugulothu

et al. 2023

Heat Trans

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The thermal performance of energy preservation systems is greatly improved by increasing miniaturization and boosting. These are imaginative (or Promethean) techniques to enhance heat transfer. Enhancement methods of heat transfer draw great attention in front of the industrial sector because of their ability to provide energy savings and raise the economic efficiency of thermal systems. Three techniques these methods are categorized; those are active, passive, and compound. Different types of components are used in passive methods because of the transfer/working fluid flow path to the enhancement of the heat transfer rate. In this article, the subject of the review was the passive heat transfer enhancement methods including inserts (conical strips, winglets, twisted tapes, baffles), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), extended surfaces (fins) and nanofluids (mono and hybrid nanofluid). Recent passive heat transfer enhancement techniques are studied in this article as they are cost‐effective and reliable, and also comparably passive methods do not need any extra power to promote the energy conversion systems' thermal efficiency than active methods. In the passive approaches, various components are applied to the heat transfer/working fluid flow path to improve the heat transfer rate. The passive heat transfer enhancement methods studied in this article include inserts (twisted tapes, conical strips, baffles, winglets), extended surfaces (fins), porous materials, coil/helical/spiral tubes, rough surfaces (corrugated/ribbed surfaces), and nanofluids (mono and hybrid nanofluid). From the pioneers' research work, it is clear that a lower twist ratio and lower pitch, lesser winglet angles can provide more heat transfer rate and a little bit more friction factor. In the case of nanofluids, a little bit of pumping power is enhanced. Finally, heat transfer enhancement is compared with the thermal performance factor, which is more than unity.

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Section: Nanofluidsmentioning

confidence: 93%

Section: Literaturementioning

confidence: 99%

“…Reynolds number 17

{\text{Re}}\,=\frac{\rho v{d}_{i}}{\mu },

where, ρ , v , and μ , are the velocity, density, and viscosity of the fluid respectively.…”

Section: Data Reductionmentioning

confidence: 99%

“…Dynamic viscosity given by Einstein is 17

{\mu }_{nf}=\frac{{\mu }_{b}}{{(1-\varphi )}^{2.5}}.

…”

Section: Data Reductionmentioning

confidence: 99%

See 2 more Smart Citations

Augmentation of heat transfer through passive techniques

Nitturi,

Kapu,

Gugulothu

et al. 2023

Heat Trans

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“…They typically modify the flow channel's surface or geometry or contain an insert, substance, or device. Researchers have utilized a variety of passive techniques to boost the rate of heat transmission in a variety of thermal devices, including the use of rough surfaces, 24,25 porous materials, 26 inserts, [27][28][29][30][31] extended surfaces, [32][33][34][35][36][37][38] displaced enhancement devices (coil/helical/ spiral tube), 39,40 nanofluids, [41][42][43][44] and so on.…”

Section: Passive Techniquesmentioning

confidence: 99%

Compound passive heat transfer augmentation techniques: A comprehensive review

Al‐Chlaihawi,

Hasan,

Ekaid

2023

Heat Trans

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The function of energy is becoming increasingly vital in meeting the requirements of modern societies and sustaining rapid economic and industrial growth globally. Heat transfer equipment has been employed for heat recovery and conversion in various domestic and industrial applications. Therefore, due to the recent global energy crisis, boosting the thermal efficiency of energy systems has become an essential requirement, which would reduce both their size and rates of energy demand. There are active and passive methods for boosting heat transfer rates. As they have no moving components, passive methods are more affordable and dependable than active ones. Applying two or more passive techniques concurrently will result in a higher heat transmission rate than any approach working independently. The current article comprehensively reviews experimental and computational investigations of passive compound forced convection heat transfer augmentation techniques at laminar, transition, and turbulent flow regimes. This article focuses on compound techniques arrangement in the form of turbulators, typical twisted tapes (TTs), surface roughness, vortex generators, and so on. The pioneering research suggests that using a lower twist ratio, lower pitch, and smaller winglet angles in TTs can result in higher heat transfer rates, albeit with a slightly increased friction factor. The combination of alternate‐axes and wings in TTs leads to more effective heat transfer enhancement within the tube.

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