Experimental investigation of heat transfer and pressure drop of turbulent flow inside tube with inserted helical coils

Sharafeldeen, M. A.; Berbish, N. S.; Moawed, M.; Ali, Rashed

doi:10.1007/s00231-016-1897-z

Cited by 26 publications

(10 citation statements)

References 18 publications

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“…These inserts can be produced easily and cheaply and installed or uninstalled rapidly in order to clean inside tubes. The other merit of these inserts is that the mechanical strength of the primary plain pipe would not be affected adversely [3].Therefore, spiral coils are advantageous in industrial applications and need to be studied further. However, it should be mentioned that the use of these devices induces considerable pressure losses.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on condensation heat transfer characteristics of R-600a in tubes with coiled wire inserts

Moghaddam

Sarmadian

Shafaee

2019

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

An experimental study on condensation heat transfer characteristics of R-600a in tubes with coiled wire inserts

Moghaddam

Sarmadian

Shafaee

2019

Applied Thermal Engineering

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“…The researchers [11] carried out an experiment for heat exchanger with internal helical coil at a range of 14400 < Re < 42900, in the turbulent regime. They examined the effect of the Reynolds number, wire diameter, and coil pitch ratio on the Nusselt number and friction factor.…”

Section: Introductionmentioning

confidence: 99%

A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

Abdulrasool¹,

Aljibory²,

Abbas³

et al. 2023

IJHT

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Heat exchangers are still in high demand for the majority of industrial applications. A double pipe heat exchanger, also known as a DPHE, is a device that is used to transfer heat from hot to cold liquids, primarily water. It is therefore of great importance to discover new methods improving their thermal-hydraulic performance. In the current computational study, the focus will be on a helical turbulator constructed with small perforations and built inside the annulus of DPHE. First, our results are validated against their counterparts of an experiment conducted by others to examine the flow under the effect of a helical solid wire and/or global air blown inside the annulus. Second, four cases are introduced to the flow inside the helical tube only, two different mass flow rates for single and two phase flows. All findings suggest that the optimal performance comes from pumping some quantity of the working fluid inside the helical tube with roughly 600% and 45% increase in terms of overall heat transfer coefficient and thermal effectiveness, respectively, compared to that of non-perforated turbulator. Furthermore, for this proposed device, single-phase flow with or without oscillations outperforms two-phase and/or steady flow.

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“…Chang et al [12] proposed an experimental study to improve the heat transfer and friction factor by employing double and triple twisted tape in tubes. They also developed correlations for calculation of Nu and f. This kind of research has been carried out in the past in an inclusive manner [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A comprehensive thermo-hydraulic analysis and optimization of turbulent TiO2/W-EG nano-fluid flow inside double-pipe heat exchangers with helical coil inserts

Ebrahimi‐Moghadam

Gohari

Hoseinzade

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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The main aim in current work is to optimize TiO 2 /W-EG nano-fluid (with 60 vol% of water and 40 vol% of ethylene glycol) flow within the inner tube of the double-pipe heat exchangers with helical coil inserts. The entropy generation is selected as the target function and is to be minimized. To reach this goal, at the first step, a comprehensive sensitivity analysis is carried out taking into account all of the nano-fluid flow conditions (including nanoparticle volume fraction , Reynolds number Re and Prandtl number Pr) and geometric parameters of the helical coil inserts (including thepitch-to-diameter ratio of coil Π). Afterward, the genetic algorithm (GA) is utilized in the optimization process. The results of sensitivity analysis reveal that and Π , respectively, have the highest and lowest impact on the thermodynamics characteristics. Also, the addition of up to 0.02 vol% nanoparticles leads to a maximum of 13.93% improvement in dimensionless entropy generation (DEG). The outputs of the GA are opt = 0.0198%, Re opt = 8421.173, Pr opt = 32.833, Π opt = 2.437 and DEG opt = 0.005086. Furthermore, based on the optimization results, a useful correlation is proposed to find the optimum geometry of the helical coil based on the nano-fluid flow conditions.

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Experimental investigation of heat transfer and pressure drop of turbulent flow inside tube with inserted helical coils

Cited by 26 publications

References 18 publications

An experimental study on condensation heat transfer characteristics of R-600a in tubes with coiled wire inserts

An experimental study on condensation heat transfer characteristics of R-600a in tubes with coiled wire inserts

A Computational Study of Perforated Helical Tube Inserted in a Double Pipe Heat Exchanger with Fluid Injection

A comprehensive thermo-hydraulic analysis and optimization of turbulent TiO2/W-EG nano-fluid flow inside double-pipe heat exchangers with helical coil inserts

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