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Dissertations / Theses on the topic 'Ribbed channel'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Leskovec, Martin. "Method Development for Heat Transfer Predictions in Channel Flows : An efficient CFD approach for ribbed stationary channels." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132166.

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Gas turbines are today used in numerous industrial and aeronautical applications. To increase the specific power output and efficiency, a high turbine inlet gas temperature is desired. The high temperature leads to the need of cooling critical components in the hot gas path. Siemens Industrial Turbomachinery AB, SIT AB, in Finspång manufactures gas turbines where the internal cooling of critical components is done through serpentine channels. To utilize the cooling air as efficiently as possible, vortex creating objects are placed inside the channel which result in higher heat transfer. To com

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2

Grosnickel, Thomas. "Simulations des grandes échelles pour la prédiction des écoulements de refroidissement des pales de turbines." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0008/document.

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Les concepteurs de moteurs aéronautiques sont constamment sujets à la demande d’augmentation de puissance de la part des constructeurs d’aéronefs. Pour satisfaire à cette exigence, la température de sortie de la chambre de combustion peut être augmentée pour améliorer le rendement et la puissance de sortie du moteur. Cette élévation de température peut toutefois dépasser le point de fusion du matériau et, pour éviter les pannes de moteur, l’intégrité des aubes de la turbine repose notamment sur des systèmes de refroidissement internes,prélevant de l'air froid du compresseur. La conception de c

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3

Shah, Anant Pankaj. "Development and application of a dispersed two-phase flow capability in a general multi-block Navier Stokes solver." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36101.

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Gas turbines for military applications, when operating in harsh environments like deserts often encounter unexpected operation faults. Such performance deterioration of the gas turbine decreases the mission readiness of the Air Force and simultaneously increases the maintenance costs. Some of the major factors responsible for the reduced performance are ingestion of debris during take off and landing, distorted intake flows during low altitude maneuvers, and hot gas ingestion during artillery firing. The focus of this thesis is to study ingestion of debris; specifically sand. The region of int

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4

Parida, Pritish Ranjan. "Optimization and Fabrication of Heat Exchangers for High-Density Power Control Unit Applications." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/77165.

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The demand for more power and performance from electronic equipment has constantly been growing resulting in an increased amount of heat dissipation from these devices. Thermal management of high-density power control units for hybrid electric vehicles is one such application. Over the last few years, the performance of this power control unit has been improved and size has been reduced to attain higher efficiency and performance causing the heat dissipation as well as heat density to increase significantly. However, the overall cooling system has remained unchanged and only the heat exchanger

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5

Sampath, Aravind Rohan. "Effect of Rib Turbulators on Heat Transfer Performance in Stationary Ribbed Channels." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1261062722.

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6

Watson, Michael. "Measurements using a triaxial hot-wire anemometer in channnels containing helically ribbed pins." Thesis, Open University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328249.

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7

Fu, Wen-Lung. "Aspect ratio effect on heat transfer in rotating two-pass rectangular channels with smooth walls and ribbed walls." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/2358.

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This study experimentally investigates the effects of rotation, the buoyancy force, and the channel aspect ratio on heat transfer in two-pass rotating rectangular channels. The experiments are conducted with two surface conditions: smooth walls and 45?? angled ribbed walls. The channel aspect ratios include 4:1, 2:1, 1:1, 1:2 and 1:4. Four Reynolds numbers are studied: 5000, 10000, 25000 and 40000. The rotation speed is fixed at 550 rpm for all tests, and for each channel, two channel orientations are studied: 90?? and 45?? or 135??, with respect to the plane of rotation. Rib turbulators are p

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8

Sundberg, Jenny. "Heat Transfer Correlations for Gas Turbine Cooling." Thesis, Linköping University, Department of Mechanical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5446.

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<p>A first part of a ”Heat Transfer Handbook” about correlations for internal cooling of gas turbine vanes and blades has been created. The work is based on the cooling of vanes and blades 1 and 2 on different Siemens Gas Turbines. The cooling methods increase the heat transfer in the cooling channels by increasing the heat transfer coefficient and/or increasing the heat transfer surface area. The penalty paid for the increased heat transfer is higher pressure losses.</p><p>Three cooling methods, called rib turbulated cooling, matrix cooling and impingement cooling were investigated. Rib turbu

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9

Perkins, Richard Mark. "PIV Measurements of Turbulent Flow in a Rectangular Channel over Superhydrophobic Surfaces with Riblets." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5547.

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In this thesis I investigate characteristics of turbulent flow in a channel where one of the walls has riblets, superhydrophobic microribs, or a hybrid surface with traditional riblets built on a superhydrophobic microrib surface. PIV measurements are used to find the velocity profile, the turbulent statistics, and shear stress profile in the rectangular channel with one wall having a structured test surface. Both riblets and superhydrophobic surfaces can each provide a reduction in the wall shear stress in a turbulent channel flow. Characterizing the features of the flow using particle image

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10

Vincent, Philippe. "L’organisation spatiale des canaux calciques cav1.3 détermine l’efficacité de l’exocytose des synapses à ruban dans les cellules ciliées de l’oreille interne." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0238/document.

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Les cellules ciliées internes (CCIs) de la cochlée encodent les signaux acoustiques en impulsions électriques au niveau des synapses à ruban formées avec les fibres afférentes du nerf auditif. L'exocytose des vésicules glutamatergiques par les CCIs est déclenchée par l'activation des canaux calciques Cav1.3 et par l'otoferline, le senseur calcique intracellulaire présumé. Les mécanismes moléculaires précis régulant cette exocytose restent encore mal compris, notamment ceux à l’origine de sa précision temporelle, sa vitesse élevée en phase avec le signal acoustique("phase-locking" jusqu'à 1-2 k

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11

Chih-YaoKuo and 郭智堯. "A Computational Investigation of Ribbed T-channel Micromixer at Low Reynolds Number." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/95014784816798380636.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>100<br>In this research numerical simulations are performed to study the mixing efficiency of T-channel mixromixers with convex ribs placed on upper and lower channel walls. A commercial CFD software and the orthogonal tables of Taguchi Method are used to set up numerical experiments to search for the rib geometric parameters of high mixing efficiency. The effect of multiple mixing interface at the inlet of the ribbed T-channel is also studied.

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12

Huang, Jui-Che, and 黃睿哲. "Experimental and Computational Study of Turbulent Flows in Reciprocating motion with Ribbed Channel." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/40182951254011346481.

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碩士<br>國立成功大學<br>造船及船舶機械工程學系<br>89<br>Experimental and Computational Study of Turbulent Flows in Reciprocating motion with Ribbed Channel Abstract This research is to investigate the unsteady turbulent flow in reciprocating motion with ribbed channel by experimental and computational study. The two—layer K-ε-E model proposed by Spalding is adopted ,and the numerical method, the SIMPLE-C algorithm proposed by Doormall is used. The result reveals that the phenomena in vortex structure of secondary flow behind the ribs changes periodically, and the vortex line stretching a

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13

Wang, Yen-Chan, and 王衍展. "Study of Mixed Convective Heat Transfer in Porous Channel with Staggered Ribbed Turbulator." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/08326933770648623711.

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碩士<br>建國科技大學<br>機電光系統研究所<br>92<br>The objective of the present work is to study the convective heat transfer in sintered porous channel. The sintered test section is made of three diameters of copper beads of 0.704, 0.830 and 1.163 mm. The characteristics of the wall temperature distribution with constant heat flux were measured. This study also reveals that heat transfer coefficients and Nusselt numbers were presented for various Reynolds numbers and heat flux. Use compress air to proceed cooling work fluid, Also facing sintered porous channel weigh rib. Using the Brinkman-extended Darcy mode

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14

Chiang, MingHung, and 江明鴻. "Velocity Measurements in a Rotating Two-Pass Square Channel with Two Oppositely Ribbed Walls." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/60494842534423034973.

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15

Lan, I.-An, and 蘭宜安. "An experimental study of thermal performance of radially rotating two-pass parallelogram ribbed channel." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hj5emt.

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博士<br>國立清華大學<br>動力機械工程學系<br>107<br>This work employed the infrared thermography method to measure the detailed Nusselt number (Nu) distributions on the leading and the trailing endwalls, as well as detected the Fanning friction factors (f), of a two-pass parallelogram ribbed channel at static and rotating conditions. This research investigated the isolated and interdependent effects of Reynolds number (Re), rotation number (Ro) and buoyancy number (Bu) influences on local and regionally averaged Nu and channel averaged f for the present static and rotating two-pass parallelogram channel with d

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16

Chong-JieWong and 翁崇傑. "Numerical simulation and optimization of turbulent fluids in a three dimensional angled ribbed channel." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/55641637130731266152.

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碩士<br>國立成功大學<br>機械工程學系<br>103<br>In this study, numerical simulations of turbulent steam forced convection in a three-dimensional angled ribbed channel with constant heat flux are investigated. The elliptical, coupled, steady-state, three-dimensional governing partial differential equations for turbulent forced convection are solved numerically using the finite volume approach. The parameters studied include angled rib height ratios, angled rib pitch ratios, rib angles and Reynolds numbers. The effects of Reynolds number, angled rib height ratio, angled rib pitch ratio, and rib angle on the fr

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17

Chen, Ping-Jr, and 陳柄儒. "Velocity Measurements in a Roating Two-Pass Square Channel with/without Two Oppositely Ribbed Walls." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/42566048006932308469.

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18

Hung, H. J., and 洪瑞鴻. "Heat Transfer Characterstics in a 45-Deg Ribbed Coolent Channel with Rotating Number Up to 2.0." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/87675562121605215569.

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19

Kao, Chao-Chieh, and 高超傑. "Experimental Study of Flow Field and Heat Transfer in a Staggered Ribbed Channel with Reciprocating Motion." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/54635595514778220384.

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20

Gao, Jing Yan, and 高靖諺. "Thermal Characteristics of A Rotating Two-Pass Square Channel Enhanced By Angled Ribbed Endwalls and Wavy Sidewalls." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/68852810139832309822.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>103<br>Detailed Nusselt number (Nu) distributions over Leading Endwall (Le-E) and Trailing Endwall (Tr-E), Fanning friction coefficients (f) and thermal performance factors (TPF) of a radially rotating two-pass square channel enhanced by in-line 45° endwall ribs and wavy sidewalls were measured at the test conditions of 5000<Re<20000, 0<Ro<0.3 and 0<Bu<0.053.. No previous study has examined the thermal performances of a rotating ribbed two-pass channel with wavy sidewalls. A selection of heat transfer data illustrates the individual and interdependent effects of

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21

Chen, Li-Chih, and 陳立志. "Computational and Experimental Analysis of Turbulent Heat Transfer in a Ribbed Rectangular Channel － Effect of Ridge Shapes." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/04644390423682030974.

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22

Liao, Hsiu Cheng, and 廖秀正. "Uneven Wall Heat Flux Effect on Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/22126152667829884364.

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碩士<br>國立中山大學<br>機械工程學系<br>87<br>This study deals with the heat transfer and pressure drop. Characteristics in rotating two-pass ribbed rectangular channel related to the internal cooling of turbine blades. The influence of rotating and uneven heating condition on the local heat transfer coefficient and pressure drop in a rotating, two pass rib-roughened rectangular channel with a cross-section aspect ratio 3 were studied for Reynolds number from 5000 to 25000 and rotating number from 0 to 0.2404.

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23

Hsiang-Jung, Chin, and 覃向榮. "Velocity Distributions in Rotating Two-pass Ribbed/Smooth Rectangular Channels." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/82993790798447152861.

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24

Peng-JenChen and 陳鵬仁. "Numerical optimization on heat transfer enhancement in ribbed/wavy channels and a rectangular enclosure." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/49213693857951390436.

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博士<br>國立成功大學<br>機械工程學系<br>103<br>In this study, a multi-parameter constrained optimization procedure integrating the design of experiments (DOE), response surface methodology (RSM), genetic algorithm (GA) and computational fluid dynamics (CFD) is proposed to design the geometric configuration for three practical cases: ribbed/wavy channels and solar collector with partitions. In view of the optimization performed in this study, the proposed procedure which combines the response surface methodology and genetic algorithm works well on designing the geometric configuration of the cases: ribbed/wa

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25

Chiang, Kuei-Feng. "Heat Transfer and Fluid Flows in Finned and Ribbed Channels with Cooling Applications to Electronic Chipsets." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2507200813121000.

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26

Chiang, Kuei-Feng, and 江貴鳳. "Heat Transfer and Fluid Flows in Finned and Ribbed Channels with Cooling Applications to Electronic Chipsets." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/99662416133679948292.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>96<br>Heat transfer and fluid flow in the finned and rib-roughened channels for electronic cooling device are investigated through experimental and numerical study. Two passive heat transfer augmentation techniques are proposed to improve PC cooler and telecom air heat exchanger. Fan-fin channel roughened by 450 staggered ribs could enhance heat transfer coefficient comparing with conventional heatsink of PC industry. As well, twin flows in rib-roughened channel were proposed to enhance effectiveness and cooling capacity of air heat exchanger of telecom. The ther

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27

Huh, Michael. "Heat Transfer in Smooth and Ribbed Rectangular Two-Pass Channels with a Developing Flow Entrance at High Rotation Numbers." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-831.

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Cooling channels with a developing flow entrance condition and aspect ratios of 1:4 and 2:1 were studied. The range of the rotation number and buoyancy parameter for the selected AR channels was extended. The maximum Ro and Bo for the 1:4 channel was 0.67 and 1.9, respectively. For the 2:1 channel, these values were 0.45 and 0.85, respectively. The effect of rib spacing and rib height on heat transfer in the 1:4 channel is investigated. Three rib spacing configurations were considered: P/e=2.5, 5, 10 with a constant e/Dh ratio of 0.078. To investigate the effect of rib height, a rib configurat

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28

Liu, Wei-Jen, and 劉偉禎. "Uneven Wall Heat Flux Effect on Local Heat Transfer in Rotating Two-pass Channels with Two Oppositely Ribbed Walls." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/38794199391156449753.

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29

Wang, Yeu-Shann, and 王與善. "Uneven Wall Temperature Effect on Local Heat Transfer and Stream Velocity in Rotating Two-Pass Channels with Two Oppositely Ribbed Walls." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/07853542404425266368.

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30

Neef, Jakob. "Molecular Physiology of the Ribbon Synapse." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-ADB1-D.

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31

Picher, Maria Magdalena. "The role of Calcium Binding Protein 2 in synaptic sound encoding and hearing." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-002B-7CC1-F.

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