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Characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helical baffles

Tingting DU, Wenjing DU

Frontiers of Engineering Management 2019, Volume 6, Issue 1,   Pages 70-77 doi: 10.1007/s42524-019-0005-8

Abstract:

The characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helicalThe ideal helical flow model was constructed to demonstrate parts of the flow characteristics of theIn a fully developed section, the distribution of velocity and wall heat transfer coefficient has a similarThe short-circuit flow accelerates the axial velocity of the flow through the triangular zone.Moreover, the back flow enhances the local heat transfer and causes the ascent of flow resistance.

Keywords： heat exchanger     overlapped helical baffle     triangular zone     helical flow    

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Effects of radiation and heat source/sink on unsteady MHD boundary layer flow and heat transfer over

Krishnendu Bhattacharyya

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 3,   Pages 376-384 doi: 10.1007/s11705-011-1121-0

Abstract: In this paper, an investigation is made to study the effects of radiation and heat source/sink on theunsteady boundary layer flow and heat transfer past a shrinking sheet with suction/injection.The flow is permeated by an externally applied magnetic field normal to the plane of flow.parameter, but it increases with heat source parameter.heat transfer.

Keywords： MHD boundary layer     unsteady flow     heat transfer     thermal radiation     heat source/sink     shrinking sheet     suction    

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Analysis of flow and heat transfer characteristics of porous heat-storage wall in greenhouse

OUYANG Li, LIU Wei

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 406-409 doi: 10.1007/s11708-008-0094-2

Abstract: The flow and heat transfer characteristics of porous heat-storage wall in greenhouse are studied by usingThe results show that the heat exchange between the air and the solid matrix of the porous heat-storageBecause the incidence of solar radiation on the porous heat-storage wall is not uniform, the new composite

Keywords： incidence     thermal conductivity     heat-storage     exchange     composite    

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Burnett simulations of gas flow and heat transfer in microchannels

Fubing BAO, Jianzhong LIN

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3,   Pages 252-263 doi: 10.1007/s11465-009-0037-6

Abstract: In micro- and nanoscale gas flows, the flow falls into the transition flow regime.The Navier-Stokes equations fail to describe the gas flow in this regime.As a result, the high-order Burnett equations are used to study the gas flow and heat transfer characteristicsaugmented Burnett equations with high-order slip boundary conditions are then used to model the gas flowand heat transfer in Couette and Poiseuille flows in the transition regime.

Keywords： micro- and nanoscale gas flow     slip-transition flow regime     Burnett equations     numerical simulation    

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A numerical study of non-Darcy flow in EGS heat reservoirs during heat extraction

Wenjiong CAO, Wenbo HUANG, Guoling WEI, Yunlong JIN, Fangming JIANG

Frontiers in Energy 2019, Volume 13, Issue 3,   Pages 439-449 doi: 10.1007/s11708-019-0612-4

Abstract: It is deduced by analogy that the fluid flow in enhanced geothermal system (EGS) heat reservoirs mayIt is found that non-Darcy effects decrease the mass flow rate of the fluid injected and reduce the heatthe seepage flow in EGS heat reservoirs.The non-Darcy flow in SCCO - EGSs may thus greatly reduce their heat extraction performance.If the calculated Forchheimer number is larger than 0.2, the fluid flow in EGS heat reservoirs experiences

Keywords： enhanced geothermal system     non-Darcy flow     heat extraction     Reynolds number     Forchheimer number    

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Flow and thermal modeling of liquid metal in expanded microchannel heat sink

Frontiers in Energy   Pages 796-810 doi: 10.1007/s11708-023-0877-5

Abstract: Liquid metal-based microchannel heat sinks (MCHSs) suffer from the low heat capacity of coolant, resultingin an excessive temperature rise of coolant and heat sink when dealing with high-power heat dissipation, reducing the temperature rise of coolant and heat sink.The flow and thermal modeling of expanded microchannel heat sink (E-MCHS) were analyzed by both usingThe heat conduction of liquid metal in Z direction and the heat convection between the top surface

Keywords： liquid metal cooling     heat sink     expanded microchannel     flow and thermal modeling    

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Characterization of 3D microstructure, thermal conductivity, and heat flow of cement-based foam using

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 643-651 doi: 10.1007/s11709-021-0709-9

Abstract: This study presents the results of the 3D microstructure, thermal conductivity, and heat flow in cement-basedThe 3D model showed that heat flows through the cement paste solids and with an increase in porositythis flow reduces.

Keywords： 3D pore volume distribution     X-ray tomography     3D shape factor     heat flow    

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Numerical simulation and experimental research on heat transfer and flow resistance characteristics ofasymmetric plate heat exchangers

Shaozhi ZHANG, Xiao NIU, Yang LI, Guangming CHEN, Xiangguo XU

Frontiers in Energy 2020, Volume 14, Issue 2,   Pages 267-282 doi: 10.1007/s11708-020-0662-7

Abstract: The asymmetric plate heat exchanger (APHE) has the possibility of achieving balanced pressure drops onboth hot and cold sides for situations with unbalanced flow, which may in turn enhance the heat transferIn this paper, the single-phase water flow and heat transfer of an APHE consisted of two types of platesThe comparison between heat transfer and flow characteristics of the APHEs and the conventional plateheat exchanger (CPHE) is made under various flow rate ratios of the hot side and the cold side and different

Keywords： plate heat exchanger     asymmetric     simulation     correlation     heat transfer enhancement    

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A novel flow-resistor network model for characterizing enhanced geothermal system heat reservoir

Jian GUO, Wenjiong CAO, Yiwei WANG, Fangming JIANG

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 99-106 doi: 10.1007/s11708-018-0555-1

Abstract: The fracture characteristics of a heat reservoir are of critical importance to enhanced geothermal systemsprocesses in heat reservoirs.network of the heat reservoir is converted into a flow-resistor network with a reasonably simple patternFor heat reservoirs with various fracture configurations, the corresponding flow-resistor networks areThe results provide insight on the tortuosity of the flow path between different wells.

Keywords： enhanced geothermal systems     flow-resistor network model     fracture characteristics     heat reservoir    

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Flow boiling heat transfer in circulating fluidized bed

Xiaoguang REN , Jiangdong ZHENG , Sefiane KHELLIl , Arumemi-Ikhide MICHAEL ,

Frontiers in Energy 2009, Volume 3, Issue 1,   Pages 85-89 doi: 10.1007/s11708-008-0067-5

Abstract: In order to enhance heat transfer and mitigate contamination in the boiling processes, a new type offluidized bed boiling system has been designed, combining a circulating fluidized bed with boiling heatFlow visualization studies concerning flow hydrodynamics within the riser column are also conducted whose

Keywords： vapor-liquid-solid three phase     flow boiling heat transfer     circulating fluidized bed    

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Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter modelfor heat exchangers

Ping ZHANG, Guoliang DING

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 535-541 doi: 10.1007/s11708-010-0113-y

Abstract: stitution (SS) method is a suitable approach to solving the transient distributed-parameter model for heatWhen the iterative initial pressure is improperly assigned, the calculated flow rates become negativeTotal fluid mass is adopted as the convergence criterion of pressure iteration instead of outlet flow

Keywords： algorithm     convergence     heat exchanger     modeling     transient    

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Experimental study on saturated flow boiling heat transfer of R290/R152a binary mixtures in a horizontal

Xin ZOU, Maoqiong GONG, Gaofei CHEN, Zhaohu SUN, Jianfeng WU

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 527-534 doi: 10.1007/s11708-010-0109-7

Abstract: An experimental study on the saturated flow boiling heat transfer for a binary mixture of R290/R152aThe heat transfer coefficients are experimentally measured over mass fluxes ranging from 74.1 to 146.5kg/(m ·s) and heat fluxes ranging from 13.1 to 65.5 kW/m .The influences of different parameters such as quality, saturation pressure, heat flux, and mass fluxon the local heat transfer coefficient are discussed.

Keywords： flow boiling     heat transfer     binary mixture     R290/R152a    

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Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 160-172 doi: 10.1007/s11708-014-0321-y

Abstract: The heat transfer coefficient between the absorber plate and air can be considerably increased by usingexperimental study has been conducted to investigate the effect of roughness and operating parameters on heatTo determine the enhancement in heat transfer and increment in thermal efficiency, the values of Nusselthave been compared with those of smooth duct under similar flow conditions.

Keywords： Nusselt number     flow rate     heat transfer     heat transfer coefficient     thermal efficiency     forced convection    

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Heat transfer and fluid flow analysis of an artificially roughened solar air heater: a CFD based investigation

Anil Singh YADAV,J. L. BHAGORIA

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 201-211 doi: 10.1007/s11708-014-0297-7

Abstract: In this paper, the effect of rib (circular sectioned) spacing on average Nusselt number and friction factor in an artificially roughened solar air heater (duct aspect ratio, AR= 5:1) is studied by adopting the computational fluid dynamics (CFD) approach. Numerical solutions are obtained using commercial software ANSYS FLUENT v12.1. The computations based on the finite volume method with the semi-implicit method for pressure-linked equations (SIMPLE) algorithm have been conducted. Circular sectioned transverse ribs are applied at the underside of the top of the duct, i.e., on the absorber plate. The rib-height-to-hydraulic diameter ratio ( ) is 0.042. The rib-pitch-to-rib-height ( ) ratios studied are 7.14, 10.71, 14.29 and 17.86. For each rib spacing simulations are executed at six different relevant Reynolds numbers from 3800 to 18000. The thermo-hydraulic performance parameter for = 10.71 is found to be the best for the investigated range of parameters at a Reynolds number of 15000.

Keywords： heat transfer     pressure drop     thermo-hydraulic performance parameter    

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Thermal-hydraulic performance of novel louvered fin using flat tube cross-flow heat exchanger

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

Frontiers in Energy 2008, Volume 2, Issue 1,   Pages 99-106 doi: 10.1007/s11708-008-0010-9

Abstract: Experimental studies were conducted to investigate the air-side heat transfer and pressure drop characteristicsof a novel louvered fins and flat tube heat exchangers.A series of tests were conducted for 9 heat exchangers with different fin space and fin length, at aconstant tube-side water flow rate of 2.8 m/h.In addition, the curves of the heat transfer coefficients vs. pumping power per unit heat transfer area

Keywords： obvious effect     different     thermal hydraulic     constant tube-side     Colburn    

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Title Author Date Type Operation

Characteristics of flow and heat transfer of shell-and-tube heat exchangers with overlapped helical baffles

Tingting DU, Wenjing DU

Journal Article

Effects of radiation and heat source/sink on unsteady MHD boundary layer flow and heat transfer over

Krishnendu Bhattacharyya

Journal Article

Analysis of flow and heat transfer characteristics of porous heat-storage wall in greenhouse

OUYANG Li, LIU Wei

Journal Article

Burnett simulations of gas flow and heat transfer in microchannels

Fubing BAO, Jianzhong LIN

Journal Article

A numerical study of non-Darcy flow in EGS heat reservoirs during heat extraction

Wenjiong CAO, Wenbo HUANG, Guoling WEI, Yunlong JIN, Fangming JIANG

Journal Article

Flow and thermal modeling of liquid metal in expanded microchannel heat sink

Journal Article

Characterization of 3D microstructure, thermal conductivity, and heat flow of cement-based foam using

Journal Article

Numerical simulation and experimental research on heat transfer and flow resistance characteristics ofasymmetric plate heat exchangers

Shaozhi ZHANG, Xiao NIU, Yang LI, Guangming CHEN, Xiangguo XU

Journal Article

A novel flow-resistor network model for characterizing enhanced geothermal system heat reservoir

Jian GUO, Wenjiong CAO, Yiwei WANG, Fangming JIANG

Journal Article

Flow boiling heat transfer in circulating fluidized bed

Xiaoguang REN , Jiangdong ZHENG , Sefiane KHELLIl , Arumemi-Ikhide MICHAEL ,

Journal Article

Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter modelfor heat exchangers

Ping ZHANG, Guoliang DING

Journal Article

Experimental study on saturated flow boiling heat transfer of R290/R152a binary mixtures in a horizontal

Xin ZOU, Maoqiong GONG, Gaofei CHEN, Zhaohu SUN, Jianfeng WU

Journal Article

Experimental study of heat transfer coefficient with rectangular baffle fin of solar air heater

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

Journal Article

Heat transfer and fluid flow analysis of an artificially roughened solar air heater: a CFD based investigation

Anil Singh YADAV,J. L. BHAGORIA

Journal Article

Thermal-hydraulic performance of novel louvered fin using flat tube cross-flow heat exchanger

DONG Junqi, CHEN Jiangping, CHEN Zhijiu

Journal Article