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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 theThe numerical simulation was adopted to describe the characteristics of helical, leakage, and bypassThis study shows the detailed features of helical flow in STHXsHB, which can inspire a reasonable optimization

Keywords： heat exchanger     overlapped helical baffle     triangular zone     helical flow    

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CFD simulation on shell-and-tube heat exchangers with small-angle helical baffles

Minhua ZHANG,Fang MENG,Zhongfeng GENG

Frontiers of Chemical Science and Engineering 2015, Volume 9, Issue 2,   Pages 183-193 doi: 10.1007/s11705-015-1510-x

Abstract: Shell-and-tube heat exchanger with helical baffles is superior to that with segmental baffles in reducingis employed, and the calculated results show that among the three baffle shapes the heat exchangers witha 1/4 sector helical baffle have the lowest pressure drop.At = 10° and 20°, 1/4 sector helical baffle heat exchangers show the best integrative performance;at = 30°, 1/4 ellipse and 1/4 sector helical baffle heat exchangers perform almost the same.

Keywords： heat transfer     pressure drop     helical baffle     CFD    

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Parametric analysis and design equation of ultimate capacity for unstiffened overlapped CHS K-joints

CHEN Yu, ZHAO Xianzhong, CHEN Yiyi

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 2,   Pages 107-115 doi: 10.1007/s11709-008-0014-x

Abstract: A finite element model simulating an experiment on unstiffened, overlapped circular hollow structureUsing this model, the stress distribution, propagation of plasticity and the failure modes of overlappedbrace-to-chord thickness ratio has relatively large effects on the failure mechanism and ultimate capacity of overlappedFinally, based on the design equation of gap joints, a formula predicting the ultimate capacity of overlapped

Keywords： regression analysis     consistent     unstiffened     plasticity     overlapped    

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Closed surface modeling with helical line measurement data

LI Ruqiong, LI Guangbu, WANG Yuhan

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 72-76 doi: 10.1007/s11465-007-0012-z

Abstract: It includes three steps: first, the cloud data are preprocessed for smoothing; second, a helical line

Keywords： free-form surface     helical     triangle     design/computer-aided manufacturing     effective    

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Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1,   Pages 55-61 doi: 10.1007/s11709-013-0194-x

Abstract: Based on the opening baffle mode for natural ventilation of city road tunnels, this paper studies theimpacts of opening baffle on natural ventilation performance by verifying numerical simulation throughBy analyzing the impacts of installation angle, dimension, location, and quantity of opening baffle onexhaust could increase by at least 30% compared to when there is no baffle. 2) The baffle reaches itsof a single baffle is better than that of multiple baffles.

Keywords： city road tunnel     numerical simulation     baffle     top opening     natural ventilation    

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Performance of vertical axis water turbine with eye-shaped baffle for pico hydropower

Zhuohuan HU, Dongcheng WANG, Wei LU, Jian CHEN, Yuwen ZHANG

Frontiers in Energy 2022, Volume 16, Issue 4,   Pages 683-696 doi: 10.1007/s11708-020-0689-9

Abstract: The turbine with an eye-shaped vertical water baffle was developed to evaluate the hydraulic performanceThe effects of the opening diameter of the water baffle and installation angle of the rotor on the flowThe results suggested that the water baffle opening at = 30 mm and the rotor at a 52° angle could achieveThe proper eye-shaped baffle not only accelerates the fluid flow and generates positive hydrodynamic

Keywords： vertical axis water turbine     eye-shaped     vertical water baffle     pico hydropower    

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Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 546-552 doi: 10.1007/s11708-010-0116-8

Abstract: Forced convection heat transfer of single-phase water in helical coils was experimentally studied.The contribution of secondary flow in the helical coil to heat transfer was gradually suppressed withHence, heat transfer coefficients of the helical tube were close to those of the straight tube underdata, heat transfer correlations for both incompressible flows and supercritical fluid flows through helical

Keywords： convective heat transfer     helical coils     high Reynolds number     supercritical pressure     variable property    

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Cutting Force Model for a Small-diameter Helical Milling Cutter

LI Xiwen, YANG Shuzi, YANG Mingjin, XIE Shouyong

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 3,   Pages 272-277 doi: 10.1007/s11465-007-0047-1

Abstract: The cutting force model for the helical milling cutter is validated by experiments.theoretical foundation for monitoring the condition of a milling process that uses a small-diameter helical

Keywords： computational     corresponding     helical milling     theoretical foundation     Characteristic    

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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: paper presents an experimental analysis of a single pass solar air collector with, and without using baffle

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

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Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO

Frontiers in Energy 2019, Volume 13, Issue 2,   Pages 284-295 doi: 10.1007/s11708-019-0613-3

Abstract: In the model of a cylindrical cavity receiver containing a helical pipe, the heat losses of the cavity

Keywords： cylindrical cavity receiver     3-D numerical simulation     geometric optimization     direct normal irradiation    

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Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamic helical

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Frontiers of Medicine 2009, Volume 3, Issue 2,   Pages 230-235 doi: 10.1007/s11684-009-0023-8

Abstract: We implemented a new protocol — multiphase dynamic helical scan to acquire CT angiography (CTA) and whole

Keywords： computed tomography angiography     computed tomography perfusion    

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Gene delivery into isolated

Nan Zheng, Ziyuan Song, Yang Liu, Lichen Yin, Jianjun Cheng

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 521-528 doi: 10.1007/s11705-017-1612-8

Abstract: In this study, we developed the cationic, -helical polypeptide that can effectively deliver DNA intoThis study therefore widens the utilities of helical polypeptide as a unique category of gene delivery

Keywords： α-helical polypeptide     plant gene delivery     protoplast     intact leaves     transfection    

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Magnetic Helical Micro- and Nanorobots: Toward Their Biomedical Applications Review

Famin Qiu, Bradley J. Nelson

Engineering 2015, Volume 1, Issue 1,   Pages 21-26 doi: 10.15302/J-ENG-2015005

Abstract:

Magnetic helical micro- and nanorobots can perform 3D navigation in various liquids with a sub-micrometerSince magnetic fields with low strengths are harmless to cells and tissues, magnetic helical micro/nanorobotsThis review provides general information on magnetic helical micro/nanorobots, including their fabrication

Keywords： magnetic helical micro/nanorobots     mobile micro/nanorobots     artificial bacterial flagella (ABFs)     functionalization    

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Application of different CFD multiphase models to investigate effects of baffles and nanoparticles on heat transfer enhancement

Ali SHAHMOHAMMADI,Arezou JAFARI

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 3,   Pages 320-329 doi: 10.1007/s11705-014-1437-7

Abstract: numbers in the range of 600 to 2100, the heat transfer of nanofluid flowing in the geometry without baffleis greater than that of water flowing through a tube with baffle, whereas the difference between theseeffects (nanofluid and baffle) decreases with increasing the Reynolds number.At higher Reynolds numbers (2100–3000) the baffle has a greater effect on heat transfer enhancement than

Keywords： CFD simulation     heat transfer     nanofluid     baffle     single phase model     multiphase model    

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Effects of baffles on separation of aqueous ethanol solution with hollow fibers

Zhihong YANG, Guoliang ZHANG, Lan LIN, Danping REN, Qin MENG, Hongzi ZHANG

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 1,   Pages 68-72 doi: 10.1007/s11705-009-0130-8

Abstract: The effects of baffles on the operation and mass-transfer characteristics in novel hollow fiber membrane contactor used in distillation were investigated. Hollow fiber membranes, coated with a 7 μm polydimethyl-siloxane, were operated as structural packing in the separation of ethanol-water solutions. The parallel flow mode was chosen for separation due to the stronger driving force of the concentration difference, in which liquid flows through the lumens of the fibers and vapor flows countercurrent-wise outside the fibers. Two baffles were installed on the shell side of the membrane contactors to enhance separation, which had a round shape with a semi-lunar hole. The results show that both baffled and unbaffled membrane contactors gave better, more productive separations than traditional packing in distillation, such as the excellent Sulzer Gauze BX structured packing. The baffled membrane contactors performed better than unbaffled ones, especially at high vapor velocities. The minimal HTU of membrane contactor with baffles could reach as low as 4.5 cm, and almost all the contactors could work well above the limit where flooding normally occurs in conventional cases. Theoretical analysis predicted that baffles helped membrane module to obtain a higher mass-transfer coefficient and a smaller mass-transfer resistance. Finally, theoretical mass-transfer coefficient and experimental value were compared as well as the contribution of each individual mass-transfer coefficients among liquid, gas and membrane.

Keywords： hollow fiber     membrane contactor     baffle     mass-transfer     ethanol-water    

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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

CFD simulation on shell-and-tube heat exchangers with small-angle helical baffles

Minhua ZHANG,Fang MENG,Zhongfeng GENG

Journal Article

Parametric analysis and design equation of ultimate capacity for unstiffened overlapped CHS K-joints

CHEN Yu, ZHAO Xianzhong, CHEN Yiyi

Journal Article

Closed surface modeling with helical line measurement data

LI Ruqiong, LI Guangbu, WANG Yuhan

Journal Article

Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

Journal Article

Performance of vertical axis water turbine with eye-shaped baffle for pico hydropower

Zhuohuan HU, Dongcheng WANG, Wei LU, Jian CHEN, Yuwen ZHANG

Journal Article

Convective heat transfer in helical coils for constant-property and variable-property flows with high

Yufei MAO, Liejin GUO, Bofeng BAI, Ximin ZHANG

Journal Article

Cutting Force Model for a Small-diameter Helical Milling Cutter

LI Xiwen, YANG Shuzi, YANG Mingjin, XIE Shouyong

Journal Article

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

Foued CHABANE,Nesrine HATRAF,Noureddine MOUMMI

Journal Article

Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation

Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO

Journal Article

Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamic helical

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Journal Article

Gene delivery into isolated

Nan Zheng, Ziyuan Song, Yang Liu, Lichen Yin, Jianjun Cheng

Journal Article

Magnetic Helical Micro- and Nanorobots: Toward Their Biomedical Applications

Famin Qiu, Bradley J. Nelson

Journal Article

Application of different CFD multiphase models to investigate effects of baffles and nanoparticles on heat transfer enhancement

Ali SHAHMOHAMMADI,Arezou JAFARI

Journal Article

Effects of baffles on separation of aqueous ethanol solution with hollow fibers

Zhihong YANG, Guoliang ZHANG, Lan LIN, Danping REN, Qin MENG, Hongzi ZHANG

Journal Article