The Effect of Baffles in Shell and Tube Heat Exchangers

Akpabio, Emmanuel M.; Oboh, Innocent O.; Aluyor, E. O.

doi:10.4028/www.scientific.net/amr.62-64.694

Cited by 7 publications

(5 citation statements)

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“…59 The membrane therein represents a micro-structured baffle, i.e., a solid structure which favors heat exchange. 60 The velocity profile and solute concentration are constant at the inlet L (u 1 ¼ 10 À6 m=s and c ¼ 1 mol=m 3 ). With these values, the P eclet number associated with the channel, defined as u 1 L=D, is unitary, while viscous diffusion is faster than mass diffusivity since the Schmidt number Sc ¼ =D is equal to 10 3 .…”

Section: Preamblementioning

confidence: 99%

Transport across thin membranes: Effective solute flux jump

2022

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A model to describe the transport across membranes of chemical species dissolved in an incompressible flow is developed via homogenization. The asymptotic matching between the microscopic and macroscopic solute concentration fields leads to a solute flux jump across the membrane, quantified through the solution of diffusion problems at the microscale. The predictive model, written in a closed form, covers a wide range of membranes behaviors, in the limit of negligible Reynolds and Peclet numbers inside the membrane. The closure problem at the microscale, found via homogenization, allows one to link the membrane micro-structure to its effective macroscopic properties, such as solvent permeability and solute diffusivity.After a validation of the model through comparison with the corresponding full-scale solution, an immediate application is provided, where the membrane behavior is a priori predicted through an analysis of its microscopic properties. The introduced tools and considerations may find applications in the design of thin microstructured membranes.

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Section: Preamblementioning

confidence: 99%

Transport across thin membranes: Effective solute flux jump

2022

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“…The factors responsible for the performance of the heat exchanger have been evaluated accordingly with temperature distribution, pressure drop, velocity variation, etc. [12][13][14][15][16][17][18][19][20][21].…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental Study of a Concentric Tube Heat Exchanger with Helical Baffle Using CFD

Chada¹,

Manda²,

Gadi³

et al. 2021

TJDU

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Heat exchangers are the most common equipment used to transfer heat from high-temperature fluid to low-temperature fluid without direct contact. The present study considers the analytical approach on a concentric tube heat exchanger with the helical baffle. The objective of the study is to reduce the size with effect to increase the effectiveness of the heat exchanger. A heat exchanger with 100 mm external diameter and 560 mm length contains a helical baffle with 20 degrees inclination. The designed heat exchanger is analysed by varying the mass flow rate of hot water from 0.25 Kg/s to 2 Kg/s at an interval of 0.25 kg/s at three different temperatures i.e. 363.16 K, 368.16 K, 373.16 K. A nanofluid is applied to cool the hot water without any loss. The mass flow rate of cold fluid is 2 Kg/s at 30 degrees Celsius. The results have displayed that the heat exchanger exhibited appreciable effectiveness at a flow rate of 0.25 Kg/s for hot water at 373.16 K temperature. There by suggesting it as the optimum model of the heat exchanger.

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“…The third technique combines both methods (passive and active techniques). Passive heat transfer techniques increase heat transfer through the installation of baffles [4,5], ribs [6], and twisted tapes [7]. Revamping channel surfaces is another method of increasing heat transfer [8].…”

Section: Introductionmentioning

confidence: 99%

“…This type of heat exchange is depicted in Figure 1. increase heat transfer through the installation of baffles [4][5], ribs [6], and twisted tapes [7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Geometric Parameters of Alternate Axis Twisted Baffles on the Local Heat Transfer Distribution and Pressure Drop in a Rectangular Channel Using a Transient Liquid Crystal Technique

2019

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This paper reports the effects of alternate axis twisted baffle geometric parameters on the heat transfer and flow characteristics within rectangular channels. In our experiments we used modified shapes of alternate axis twisted baffles according to relative pitch ratios (s/w) equal to 2–12 and twist ratios (y/w) equal to 1–5, under conditions where the angle of attack (α) was 90° and the relative blockage height (e/Dh) was at a constant value of 0.095. The results for the Reynolds numbers based on the duct hydraulic diameter ranged from 9000 to 24,000 at a constant Prandtl number, Pr = 0.707, using air as a working fluid. A 0.05 mm thick stainless-steel foil was used as a heater, and a thermochromic liquid crystal technique was used to obtain the local temperature distribution on the heated surfaces. Images were captured in areas with periodic, fully developed regions in the channel. The results show that rectangular channels equipped with alternate axis twisted baffles demonstrated 80%–185% greater heat transfer than rectangular channels with no baffles. Channels with alternate axis twisted baffles at higher twist ratios (y/w) and smaller relative pitch ratios (s/w) showed increased heat transfer, as well as pressure loss within the system, compared with other types of twisted baffles. The thermal enhancement factor of the rectangular channels equipped with alternate axis twisted baffles was higher than that for transverse baffles and smooth channels under similar operating conditions.

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The Effect of Baffles in Shell and Tube Heat Exchangers

Cited by 7 publications

References 0 publications

Transport across thin membranes: Effective solute flux jump

Transport across thin membranes: Effective solute flux jump

Experimental Study of a Concentric Tube Heat Exchanger with Helical Baffle Using CFD

Influence of Geometric Parameters of Alternate Axis Twisted Baffles on the Local Heat Transfer Distribution and Pressure Drop in a Rectangular Channel Using a Transient Liquid Crystal Technique

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