Recent developments in enhanced heat transfer

Bergles, A. E.

doi:10.1007/s00231-011-0872-y

Cited by 110 publications

(40 citation statements)

References 26 publications

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“…It is worthwhile to compare the effectiveness of CYL, CRP and CDP with respect to CHL and we use the following metrics for the comparison among these configurations. We define efficiency index (η) [51], h f     (15) where η h and η f are enhancement factors for the heat transfer and pumping power, respectively, defined as follows [51], for channel mean h mean Nu Nu   (16) for channel avg f avg P P   (17) We plot the efficiency indices for CYL, CRP and CDP in Fig. 15c (first set of red bars), which shows that CDP is 10% and 6% more efficient than CYL and CRP, respectively.…”

Section: Quantification Of Augmentation In Heat Transfermentioning

confidence: 99%

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Soti

Bhardwaj

Sheridan

2015

International Journal of Heat and Mass Transfer

105

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Flow-induced deformation of thin structures coupled with convective heat transfer has potential applications in energy harvesting and is important for understanding functioning of several biological systems. We numerically demonstrate large-scale flow-induced deformation as an effective passive heat transfer enhancement technique. An in-house, strongly-coupled fluidstructure interaction (FSI) solver is employed in which flow and structure solvers are based on sharp-interface immersed boundary and finite element method, respectively. In the present work, we validate convective heat transfer module of the in-house FSI solver against several benchmark examples of conduction and convective heat transfer including moving structure boundaries. The thermal augmentation is investigated as well as quantified for the flow-induced deformation of an elastic thin plate attached to lee side of a rigid cylinder in a heated channel laminar flow. We show that the wake vortices past the plate sweep higher sources of vorticity generated on the channel walls out into the high velocity regions -promoting the mixing of the fluid. The self-sustained motion of the plate assists in convective mixing, augmenting convection in bulk and near the walls; and thereby reducing thermal boundary layer thickness as well as improving Nusselt number at the channel walls. We quantify the thermal improvement with respect to channel flow without any bluff body and analyze the role of Reynolds number, Prandtl number and material properties of the plate in the thermal augmentation.

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Section: Quantification Of Augmentation In Heat Transfermentioning

confidence: 99%

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Soti

Bhardwaj

Sheridan

2015

International Journal of Heat and Mass Transfer

105

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“…Enhancement of heat transfer is one of the ways used for energy saving. Various methods have been done for the use of energy savings; both are the passive and active methods [1][2][3]. Passive enhancement methods include a surface coating, rough and finned surfaces, insertion devices, curved geometry, and nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation Criterion of Nanofluid

Sudarmadji¹,

Sap²,

Santoso³

2018

Microfluidics and Nanofluidics

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In this chapter, we will discuss the increase of heat transfer as well as the increase in pressure drop to determine whether nanofluid is feasible for use in practical applications. Addition of nanoparticles will change the thermal properties of the cooling fluid, by calculation with performance evaluation criterion (PEC). If PEC < 1, then the heat transfer performance is less than the pumping power, so the system is not feasible for use in increasing heat transfer. If PEC = 1, then the heat transfer performance is smaller equal to the pumping power so that the system does not have an impact on increasing heat transfer. If PEC > 1, then the heat transfer performance is higher than the energy used to drive the fluid or pumping power, and then it can be accepted as a solution to the problem of increasing heat transfer, so that the system is feasible for use in practical applications.

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“…In this section we review some of the important studies and research that has been accomplished during the past few years and was directly related to the numerical modelling and analysis of thermo-fluid domain in SS and may help us to understand as well as control it. The gas injection method has a direct impact on the boundary layer flow in the vicinity of the surface which led to a significant impact on the heat transfer rate [74]. Hamed et al [75] studied numerically the augmentation of heat and mass transfer between a gas and liquid phase by injection of various gases through water bed such as air, carbon dioxide and helium.…”

Section: Studies Related To Ss Thermo-fluid Modelingmentioning

confidence: 99%

Computational fluid dynamic as a tool for solar still performance analysis and design development: a review

Kabeel¹,

El‐Said²,

Abdulaziz³

2019

Desalination and Water Treatment

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a b s t r a c tComputational fluid dynamic (CFD) is a simulation tool which utilizes the applied and computational mathematics for fluid flow regimes modeling to predict the heat, mass and momentum transfer behavior. In recent years, the solution's accuracy of the CFD simulations became within the acceptable range demonstrating that CFD is a valid tool for performance analysis and design development for many thermal-hydraulic systems. This encourages researchers to use it in the modeling of evaporation and condensation phenomena or two-phase flow with a vapor-liquid phase change process and mass and heat transports through the interface simulation which is one of the urgent difficulties in the solar stills development and analysis. The aim of this is to introduce a comprehensive review work of the highlights that have been made through the recent years for most important studies about the CFD approach as a tool for performance prediction and analysis in addition to design improvement and development for solar stills. This study is supported with a compact synopsis in the form of, computational domain (two or three dimensional), CFD software utilized, operating and geometrical parameter range, simplified assumptions and the better CFD results.

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Recent developments in enhanced heat transfer

Cited by 110 publications

References 26 publications

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

Performance Evaluation Criterion of Nanofluid

Computational fluid dynamic as a tool for solar still performance analysis and design development: a review

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