Pressure drop and heat transfer study in tube-in-tube helical heat exchanger

Kumar, Vimal; Saini, Supreet; Sharma, Manish; Nigam, K.D.P.

doi:10.1016/j.ces.2006.01.039

Cited by 195 publications

(113 citation statements)

References 23 publications

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“…The influence of chaotic advection on heat transfer has been numerically and experimentally investigated [17][18][19][20][21]. Results in a single channel are promising.…”

Section: Introductionmentioning

confidence: 79%

Implementation of ‘chaotic’ advection for viscous fluids in heat exchanger/reactors

Anxionnaz‐Minvielle

Tochon

Couturier

et al. 2017

Chemical Engineering and Processing: Process Intensification

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 17719 A B S T R A C TWhen viscous fluids are involved, laminar hydraulic conditions and heat and mass transfer intensification are conflicting phenomena. A channel geometry based on Split-And-Recombine (SAR) patterns is experimentally investigated. The principle implements the Baker's transformation and 'chaotic' structures are generated to promote heat and mass transfer. This work assesses the energy efficiency of different heat exchanger/reactors integrating these SAR patterns.The heat transfer capacity is assessed and compared with the energy consumption of each mock-up. It is sensitive to the cooling mode and to the number of SAR patterns per length unit as well.The continuous oxidation of sodium thiosulfate with hydrogen peroxide has been implemented. Conversions up to 99% are reached according to the utility fluid temperature and the residence time.Finally, the whole performances of the SAR geometries are compared to a plate-type heat exchanger/ reactor with a corrugated pattern. The more viscous the fluid, the more the energy efficiency of the SAR design increases compared to the corrugated design because of the balance between advection and diffusion mechanisms. The interest in terms of energy efficiency in working with SAR heat exchanger/ reactor appears from Reynolds numbers below 50.

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“…The influence of chaotic advection on heat transfer has been numerically and experimentally investigated [17][18][19][20][21]. Results in a single channel are promising.…”

Section: Introductionmentioning

confidence: 79%

Implementation of ‘chaotic’ advection for viscous fluids in heat exchanger/reactors

Anxionnaz‐Minvielle

Tochon

Couturier

et al. 2017

Chemical Engineering and Processing: Process Intensification

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“…The obtained results were compared to results for a straight tube and an angular duct using Konakov's [54] equation as suggested by Gnielinski [51,53]. Stabilizing elements, such as baffles, which may be introduced into the outer tube to enhance turbulence and thus heat transfer can further increase the friction factor as experiments from Kumar et al [70], as well as Mandal and Nigam [59], showed.…”

Section: Outer Tube Friction Factorsmentioning

confidence: 99%

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

2017

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Mineral calcination worldwide accounts for some 5-10% of all anthropogenic carbon dioxide (CO 2 ) emissions per year. Roughly half of the CO 2 released results from burning fossil fuels for heat generation, while the other half is a product of the calcination reaction itself. Traditionally, the fuel combustion process and the calcination reaction take place together to enhance heat transfer. Systems have been proposed that separate fuel combustion and calcination to allow for the sequestration of pure CO 2 from the calcination reaction for later storage/use and capture of the combustion gases. This work presents a new tube-in-tube helical system for the calcination of minerals that can use different heat transfer fluids (HTFs), employed or foreseen in concentrated solar power (CSP) plants. The system is labeled 'flameless' since the HTF can be heated by other means than burning fossil fuels. If CSP or high-temperature nuclear reactors are used, direct CO 2 emissions can be divided in half. The technical feasibility of the system has been accessed with a brief parametric study here. The results suggest that the introduced system is technically feasible given the parameters (total heat transfer coefficients, mass-and volume flows, outer tube friction factors, and -Nusselt numbers) that are examined. Further experimental work will be required to better understand the performance of the tube-in-tube helical system for the flameless calcination of minerals.

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“…They have modelled the heat transfer from hot fluid to cold fluid using the CFD package PHOENICS 3.3 and found out the overall heat transfer coefficients for counter current and parallel flows. Pressure drop and heat transfer in tube-in-tube helical heat exchanger under turbulent flow conditions was studied by Vimal Kumar et al (2006) using the CFD package FLUENT 6. However, no correlation for estimation of Nu was given in these papers.…”

Section: Heat Transfer In Single-phase Flowmentioning

confidence: 99%

Helically Coiled Heat Exchangers

Jayakumar¹

2012

Heat Exchangers - Basics Design Applications

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Pressure drop and heat transfer study in tube-in-tube helical heat exchanger

Cited by 195 publications

References 23 publications

Implementation of ‘chaotic’ advection for viscous fluids in heat exchanger/reactors

Implementation of ‘chaotic’ advection for viscous fluids in heat exchanger/reactors

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

Helically Coiled Heat Exchangers

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