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Dissertations / Theses on the topic 'Tube insert'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Plánková, Tereza. "Moderní technologické prvky pro trubkové výměníky tepla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416433.

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The aim of this diploma thesis is to get acquainted with modern technological elements currently used in shell-and-tube heat exchanger in the shell-side and tube-side, thermal-hydraulic calculation of selected elements and comparison of thermal-hydraulic properties with classically used competing technological elements. The work deals mainly with EM baffle in the tube-side and tube inserts like the twisted tape type (and its modifications) and coiled wire in the tube-side. The theoretical part is focused on acquaintance with classical technological elements in shell-and-tube heat exchanger and

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2

Teparkum, Sirasak. "Interaction Between Insects and Apple (Malus X Domestica Borkh.): Insect Behavior, Genotypic Preference, and Plant Phenolics With Emphasis on Japanese Beetle (Popillia Japonica Newman)." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27920.

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Leaves and fruit of nine apple (Malus x domestica Borkh.) genotypes were evaluated for insect injury in 1998 and 1999. Foliar and fruit injury from 12 insect species was inconsistently affected by genotype. Spraying trees with oil affected neither fruit insect injury nor fruit phytotoxicity. In choice feeding assays, incidence of Japanese beetle (JB) feeding and leaf area consumed was greater for 'Liberty' than for 'York.' Genotypes did not differ in no-choice feeding assays. Choice and no-choice feeding assays between apple and oak indicated that JB could distinguish host plants in an artif

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3

Webster, Matthew R. "Material Characterization of Insect Tracheal Tubes." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71708.

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The insect respiratory system serves as a model for both robust microfluidic transport and mate- rial design. In the system, the convective flow of gas is driven through local deformations of the tracheal network, a phenomenon that is dependent on the unique structure and material properties of the tracheal tissue. To understand the underlying mechanics of this method of gas transport, we studied the microstructure and material properties of the primary thoracic tracheal tubes of the American cockroach (Periplaneta americana). We performed quasi-static uniaxial tests on the tissue which reveal

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4

Wills, Amanda Jane. "Mitigation of biofouling using tube inserts in conjunction with biocides." Thesis, University of Birmingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396232.

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5

Flint, H. M., and J. R. Merkle. "Pink Bollworm Field Testing New Polyethylene Tube Dispenser for Gossyplure." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/204082.

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6

Cox, Lewis Michael. "Patterns of Hemolymph Pressure Related to Tracheal Tube Collapse in the Beetle Pterostichus commutabulis." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/42719.

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Rhythmic collapse and reinflation of tracheal tubes is a form of active ventilation that augments convective gas exchange in multiple orders of insects. The underlying mechanism driving this phenomenon is not known. Among other things, tracheal tube collapse could be caused by either direct impingement of trachea or by a difference of pressure gradients between the intra-tracheal air and the surrounding hemolymph. To determine the relationship between hemolymph pressure and tracheal tube collapse in the ground beetle (Pterostichus commutabulis), we performed direct measurements of hemolymph pr

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7

Mogaji, Taye Stephen. "Theoretical and experimental study on convective boiling inside tubes containing twisted-tape inserts." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18147/tde-21102014-103453/.

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This research comprises an experimental and theoretical study on convective boiling inside tubes containing twisted-tape inserts. The demand for more compact and efficient thermal systems, in which the heat exchangers plays an important role, has led to the development and use of various heat transfer enhancement techniques. Among them twisted-tape insert as a swirl flow device is one of the most used. Twisted-tape inserts have been used for over more than one century ago as a technique of heat transfer enhancement applied to heat exchangers. However, the heat transfer augmentation comes toget

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8

Oni, Taiwo Oluwasesan. "Numerical investigation of heat transfer and fluid flow in tubes induced with twisted tape inserts." Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6237/.

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Heat energy is important to all aspects of life. Various industries including food processing plants, chemical processing plants, thermal power plants, refrigeration and air conditioning equipments, petrochemical plants, etc. are faced with the problems of effective utilization, conservation and recovery of heat. The production of heat exchangers involves huge investments for capital and operation costs. In view of this, it has become important to design heat exchangers that will be efficient and also save energy, cost and materials. Different techniques known as heat transfer enhancement are

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9

Stephen, Susan. "mRNA, microtubules and motor proteins : investigations into mRNA translocation along nutritive tubes of an hemipteran insect." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312416.

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10

You, Lishan. "Computational Modeling of Laminar Swirl Flows and Heat Transfer in Circular Tubes with Twisted-Tape Inserts." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1029525889.

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11

Ritchie, John Murray. "Pressure loss and heat transfer for single-phase turbulent flow in tubes fitted with wire-matrix inserts." Thesis, University of Birmingham, 2009. http://etheses.bham.ac.uk//id/eprint/1228/.

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Heat transfer enhancement devices have become widely accepted as a method of enhancing exchanger performance and changing duties to either improve output or meet new operating requirements. hiTRAN® wire matrix inserts consist of a number of loops wound around a central core consisting of two intertwined wires. These inserts see a number of applications inside industrial tubular heat exchangers. They work by removing the laminar boundary layer that is often a dominant resistance to heat transfer, and mixing it with the core flow. This thesis presents research undertaken into the performance cha

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12

Desbordes, Cloé. "Étude du contact mécanique et électrique réalisé par hybridation de micro-tubes oxyde et de nano-inserts." Electronic Thesis or Diss., Paris, HESAM, 2024. http://www.theses.fr/2024HESAE017.

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L’assemblage flip-chip de composants photoniques à faible pas pixel, particulièrement sensibles car constitués de matériaux hétérogènes, rencontre de nombreux verrous technologiques liés à l’utilisation de procédés traditionnels impliquant une montée en température (thermocompression, brasage, etc.). L’assemblage par insertion à température ambiante, à l’aide d’interconnexions dont la fabrication est compatible avec les procédés traditionnels de fonderie, s’avère donc être une solution adaptée à ces problématiques. L’objectif de cette thèse est de développer ce procédé d’assemblage à travers l

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13

Jordão, Alexandre Luis. "Efeitos da ingestão de carboidratos com reguladores de crescimento de insetos na reprodução de Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae)." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11146/tde-13042009-152240/.

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O presente trabalho foi subdividido em quatro capítulos com os seguintes objetivos: (i) apresentar revisão bibliográfica abordando as principais referências presentes na literatura sobre a cultura da batata, Solanum tuberosum L. (Solanaceae), os aspectos bioecológicos da traça-da- -batatinha, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae), os hormônios no desenvolvimento dos lepidópteros e a atuação de alguns reguladores de crescimento de insetos (RCIs); (ii) avaliar a ingestão dos carboidratos por adultos de P. operculella e sua influência na reprodução da espécie; (iii) testar p

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14

Campbell, Robert M. (Robert McLean). "Investigation of an hsp68-lacZ transgene inserted at the dystonia musculorum locus and expressed in the neural tube floor plate." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41344.

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Experiments involving the random insertion of foreign DNA constructs into the genome have frequently had unanticipated but informative consequences. In the Tg4 line of transgenic mice, an hsp68-lacZ transgene caused an insertional mutation of the dystonia musculorum (dt) locus. In the same line, the transgene gained an ectopic expression pattern in the neural tube floor plate. The co-occurence of these events suggested that the dt phenotype of postnatal sensory neuropathy might arise from a primary defect expressed in floor plate cells. To test this hypothesis, the cellular target of the dt mu

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15

Mohammed, Ahmed Mohammed Ahmed. "Germline transformation and isolation of midgut related genes from the potato tuber moth, Phthoramiaea operculella, (Lepidoptera: Gelechiidae)." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1163.

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Potato production in tropical and subtropical countries suffers from damage caused by the potato tuber moth (PTM), Phthorimiaea operculella. Development of a germline transformation system and the identification of genes that are differentially expressed within the PTM midgut are the main goals of this research. We tested three components that are critical to genetic transformation systems for insects; promoter activity, marker gene expression, and transposable element function. We compared the transcriptional activities of five different promoters, hsp70, hsp82, actin5C, polyubiquitin and ie1

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16

Aboelkassem, Yasser. "Novel Bioinspired Pumping Models for Microscale Flow Transport." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28674.

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Bioinspiration and biomimetics are two increasingly important fields in applied science and mechanics that seek to imitate systems or processes in nature to design improved engineering devices. Here, we are inspired and motivated by microscale internal flow transport phenomena in insect tracheal networks, which are observed to be induced by the rhythmic tracheal wall contractions. These networks have been shown to mange fluid very efficiently compared to current state-of-the-art microfluidic devises. This dissertation presents two versions of a novel bioinspired pumping mechanism that is ne

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17

Wu, FengYu, and 吳豐宇. "Turbulent air flow in a horizontal tube with strip type inserts." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/88290825374067281883.

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18

Chen, Cheng-An, and 陳誠安. "Heat transfer enhancement of circular tube inserted with spring coil." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/60340391091122717456.

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碩士<br>國立中興大學<br>機械工程學系所<br>102<br>Heat transfer and pressure drop data in smooth tubes inserted with various wire coils were measured respectively. Water and air were individually considered as working fluid. The wire diameter (e) and pitch (p) of the wire coils were in the range 1 - 1.8 mm and 18 - 32 mm respectively. For tightness between the wire coil and tube wall, three tubes with different inner diameters (12.8, 13.4 and 13.8 mm) were adopted. This work not only established correlations of Nu and f, but also examined performance indexes (r 1 , r 2 and r 3 ) of the test tubes. The r 1 rep

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19

Huang, I.-Wei, and 黃一衛. "Laminar Heat Transfer and Flow Characteristics in a Horizontal Tube With Strip-Type Inserts." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/67694997333392122056.

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20

Patra, Shalini. "CFD analysis of heat transfer augmentation for flow through a tube using wire coil inserts." Thesis, 2013. http://ethesis.nitrkl.ac.in/4735/1/109CH0089.pdf.

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The need to increase the thermal performance of heat transfer equipments has led to the development and use of many heat transfer augmentation techniques. This project deals with the analysis of heat transfer augmentation for fluid flowing through pipes using CFD. Friction factor and Nusselt number for water flowing through the specified pipe (internal diameter = 0.022 m, length = 2.5 m) were obtained first for the smooth pipe and then for the pipe with a wire coil insert in the Reynolds number range of 250 to 25,000 and Prandtl number of 6.97. Three wire coils with pitch 0.033 m, 0.044 m and

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21

Liu, MingHo, and 劉明和. "An Experimental Study of Turbulent Heat Transfer in A Horizontal Circular Tube with Strip Type Inserts." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/74129791618767240281.

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22

Ji, Tianfu. "Heat transfer enhancement during condensation in smooth tubes with helical wire inserts." Thesis, 2008. http://hdl.handle.net/10210/804.

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D.Ing. (Mechanical Engineering)<br>In the past two decades the refrigeration, air-conditioning and heat pump industries began the conversion from chlorofluorocarbon (CFC) refrigerants to hydrochlorofluorocarbons (HCFCs) and to natural refrigerants. This changeover not only involves redesigning, re-optimizing and re-testing all new original equipment but also involves retrofitting many large existing systems. Combining this process with the goal of developing more accurate design methods and more energy-efficient cycles, heat transfer and, specifically, heat transfer enhancement, has become a v

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23

Wen, Mao Yu, and 溫茂育. "Thermohydraulic analysis in surface-roughened annuli and inserted tubes." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/42049025589689596007.

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24

Tsai, Yao-Chun, and 蔡曜駿. "Evaporative Heat Transfer in Horizontal Tubes with Strip-Type Inserts Using Refrigerant-600a." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/98269206075797932979.

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碩士<br>國立中山大學<br>機械工程學系<br>87<br>The research will be performed experimentally. The test section is a copper horizontal tube heated indirectly by the coil with direct electrical current. The test tube has a heated length of 2 m, and outside and inside diameters of 12.7mm and 10.6mm, respectively. Based on the experiments, we want to find the evaporative heat transfer characteristic of R-600a and conduct an analysis on enhanced tubes with inserts. There are four inserts considered in the study which include longitudinal strip, crossed strip, perforated strip(I), and perforated strip(II).

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25

Sahu, Samir Kumar. "Experimental Studies on Heat Transfer Augmentation using Triangular Wavy Tape (TWT) As Inserts For Tube Side Flow Of Liquids." Thesis, 2013. http://ethesis.nitrkl.ac.in/4945/1/109CH0457.pdf.

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The present work deals with the introduction of Stainless Steel Triangular Wavy Tape (TWT) as inserts as passive augmentation device, in the inner tube side of a Double Pipe Heat Exchanger. The effect of turbulence on the heat transfer and pressure drop was compared with the values of smooth tube. Experimental studies have also been made on the different modified designs of the TWT by drilling hole of different sizes and at different positions and also by providing baffles. The experiment was conducted using a Double Pipe Heat Exchanger consisting of inner pipe of ID 22 mm and OD 25 mm, and an

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26

Subudhi, Sarthak. "Experimental studies on pressure drop for flow through tubes using twisted galvanised iron wire insert with and without baffles." Thesis, 2014. http://ethesis.nitrkl.ac.in/6358/1/110CH0471-5.pdf.

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This project work, “Experimental studies on pressure drop for flow through tubes using Galvanised Iron wire insert with and without baffles” was undertaken in a view of studying the effect of turbulence on pressure drop of a heat exchanger. Most of the commercial, domestic and industrial applications where conversion or utilisation of energy is involved require a heat exchange process. This project deals with the introduction of three and four Galvanised Iron wires with and without baffles as passive augmentation device. The baffles used in the experiment were made up of thin tin sheets. By in

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27

Johar, Gaurav, and Virendra Hasda. "Experimental studies on heat transfer augmenatation Using modified reduced width twisted tapes (RWTT) as Inserts for tube side flow of liquids." Thesis, 2010. http://ethesis.nitrkl.ac.in/1842/1/Gaurav(10600023)_Virendra(10600006)_ethesis.pdf.

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This project report deals with the use of modified twisted tape inserts as Passive Heat transfer augmentation device. Effect of Reduced width twisted tape (RWTT), Baffled Reduced width twisted tape (BRWTT1) & Baffled Reduced width twisted tape with holes (BRWTT2) on heat transfer and friction factor for heating of water for Reynolds number range 2500-30000, was studied experimentally in a double pipe heat exchanger. Three tapes of different twist ratio (yw=3.69, yw=4.39, yw=5.25) for RWTT, BRWTT1 & BRWTT2 were used. Based on constant flow rate, the heat transfer coefficient were found to be 1

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28

Patro, Jitendra Kumar, and Abhinav Malviya. "Experimental Studies on Heat Transfer Augmentation Using TMT Rods with and without Baffles as Inserts for Tube Side Flow of Liquids." Thesis, 2012. http://ethesis.nitrkl.ac.in/3239/1/Thesis_108CH041_047.pdf.

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This project deals with the introduction of TMT rods as inserts as passive augmentation device, in the flow path of inner tube side liquid flow. The effect of turbulence on heat transfer & pressure drop was compared with the values for smooth tube. The effect of baffles was also taken into account and again a comparative study was made on the basis of varying the baffle spacing. All the results and readings were compared with the standard data from the smooth tube. Whenever it comes to enhance the heat transfer between the surfaces or in other words augmenting the heat exchanger, the pressure

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29

Dhanibabu, Talakala. "CFD Analysis for Heat Transfer Augmentation Inside Plain and Finned Circular Tubes with Twisted Tape Inserts." Thesis, 2013. http://ethesis.nitrkl.ac.in/4734/1/211CH1257.pdf.

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Computational fluid dynamic (CFD) studies were carried out by using the ANSYS FLUENT 13.0 to find the effects of twisted tape insert on heat transfer, friction loss and thermal performance factor characteristics in a circular tube at constant wall temperature. Simulation was performed with Reynolds number in a range from 800 to 10,000 using water as a working fluid. Four turbulent models are examined such as a standard k-ϵ, RNG k-ϵ, standard k-w and SST k-w and those compared with standard twisted tape correlations developed by Manglik and Bergles. Plain tube with four different full width twi

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30

Chang, Liang-Cheng, and 張良政. "A Numerical Study of Developing 3-D Turbulent Mixed Convection in a Circluar Tube Inserted with Longitudinal Strips." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/81297784513830372849.

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31

P, Dhanush. "Experimental studies on heat transfer augmentation for flow of liquid through circular tubes using twisted gi wires with and without baffles as insert." Thesis, 2014. http://ethesis.nitrkl.ac.in/6357/1/110CH0468-4.pdf.

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This project deals with the use of twisted GI wires as passive heat transfer augmentation device. Effect of twisted GI wires without baffles and with baffles, with varying baffle spacing, was studied experimentally in a double pipe heat exchanger. Effect of insert with three different baffle spacing (24cm, 12cm, 6cm) were studied. The effect of turbulence created by twisted wires & baffles on Nusselt number was compared with that of smooth tube. Based on constant flow rate, the nusselt numbers were found to be 1.23-1.42, 1.32-1.5 &1.49-1.65 times the smooth tube values for baffle spacing of 24

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32

Tsai, Wu-chuan, and 蔡武全. "Evaporation heat transfer and pressure drop characteristics of R-290/ R-600a refrigerant-lubricant mixtures in the micro-fin tubes within inserts." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/25717135152542614422.

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碩士<br>正修科技大學<br>機電工程研究所<br>95<br>This study reports an experimental investigation of heat transfer and pressure drop behavior during evaporation of R-290 and R-600a mixed with the lubricating oil (150SUS) in the micro-fin tubes within four different inserts (twined coil, wire coil, twisted tape, and helical-coil). The test were conducted at the saturation temperature of 15 , inlet oil concentration from 0 to 5 mass% oil, mass flux of 200 – 500 and the heat flux of 10.24 . The evaporation heat transfer coefficients for the present study display a common trend in that the heat transfer coeffici

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33

Huang, Ping-Chung, and 黃秉中. "Effects of Hydraulic Behavior on Ultrafiltration in a Membrane Tuble Inserted Concentrically with a Solid Rod of Varied Diameter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/82879719339947098472.

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碩士<br>淡江大學<br>化學工程學系<br>91<br>Increasing of the fluid velocity in a cross-flow membrane ultrafilter has two conflict effects. The decrease of concentration-polarization resistance is advantageous for ultrafiltration, on the other hand, the decrease of average transmembrane pressure, has no benefit for the performance. Since along the flow channel of a cross-flow membrane ultrafiltration, the concentration- polarization increases while the transmembrane pressure decreases. Therefore, proper adjustment of the convection strength along the flow channel might effectively suppress the undesirable c

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34

Sung, Chao-Chung, and 宋朝鐘. "Construction of a Predictive Maintenance Model for Boiler based on Instrumented Tubes Equipped with Insert Type of Thermocouples－A Case of Steam Boiler of Taichung Power Plant-Unit 1." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/15516803265111180943.

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碩士<br>朝陽科技大學<br>工業工程與管理系碩士班<br>91<br>Although preventive maintenance, when it is appropriate, can reduce the frequency of failures, it is often difficult to determine the proper maintenance interval and scope of a preventive maintenance program. Preventive maintenance action performed too frequently may actually decrease availability. An alternative proactive maintenance concept is predictive or diagnostic maintenance. According to failure statistics of boiler tubes, they almost are due to abnormal metal temperature caused by internal scaling, the losses of boiler does not work is at least NT$

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