Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 179 for “"heat transfer coefficients"”.
-
Heat transfer coefficients in a falling film condenser
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1935
-
Heat transfer coefficients of particulate in tubular heat exchangers
This experimental study explores the heat transfer from heated bare and finned tubular surfaces to particulates in packed bed cross flow. The results from this experiment will be used to help select the type of particulates that will be used. Additionally, these results will assist in estimating …
-
Extended Surface Heat Transfer Coefficients via Endwall Temperature Measurements
… the experimental process used to obtain average heat transfer data on the pin surface, at the expense of additional post processing complexity. The method is based on a unique, analytical solution of the longitudinal conduction equation with internal heat generation, allowing computation of heat …
-
Calculation of Local Heat Transfer Coefficients in Containment After a Loca
Made available in DSpace on 2017-07-06T18:55:06Z (GMT). No. of bitstreams: 3 Leung_Dominic_M_MS.pdf: 34136601 bytes, checksum: 44a40444c0e1c70eae6f96ecb6746631 (MD5) Leung_Dominic_M_MS_ABS.pdf: 452218 bytes, checksum: 53d9dd977a0bc1f5e2366ff5d6d3ba43 (MD5) license.txt: 4813 bytes, checksum: …
-
Heat transfer coefficients between condensing organic vapors and a vertical copper tube
… resistance thermometers so that a complete heat balance could be run on the system. The copper tube on which condensation took place was placed inside a standard four inch Pyrex glass pipe, and vapors were fed into the annular space between glass pipe and copper tube from. a simple still …
-
Experimental investigation of local air-side heat transfer coefficients of heat exchanger fins via an absorption-based mass transfer method
It is challenging to measure local air-side heat transfer coefficients (HTCs) with high accuracy due to the complexity of the involved surface geometries. An absorption-based mass transfer method has been developed to obtain local air-side HTCs. The method relies on measuring convective mass …
-
Using the inverse heat conduction problem and thermography for the determination of local heat transfer coefficients and fin effectiveness for longitudinal fins
Heat transfer is a physical process in which energy is exchanged. It occurs in numerous applications, such as production of electricity, building climatisation, food preparation,... Since energy consumption has increased tremendously in the last decades and this trend will continue, the concept of …
-
The determination of heat-transfer coefficients from finned cylinders in an air stream at varying fin-plane/air-stream angles, fin spacing, and air velocities
… investigations have been made in the field of heat-transfer from finned cylinders in an air-stream with the fin-plane parallel to the air-stream. Most of these investigations have been made by the National Advisory Committee on Aeronautics (NACA) at Langely Memorial Aeronautical Laboratory, …
-
Heat transfer via dropwise condensation on hydrophobic microstructured surfaces
… has the potential to greatly increase heat transfer rates. Heat transfer coefficients by dropwise condensation and film condensation on microstructured silicon chips were compared. Heat transfer coefficients are found to be seventy percent higher in the hydrophobic, dropwise …
-
Carbon Dioxide and R410A Flow Boiling Heat Transfer, Pressure Drop, and Flow Pattern in Horizontal Tubes at Low Temperatures
… systems. In this study, CO2 flow boiling heat transfer coefficients and pressure drop are measured in macro-scale (6.1 and 3.5 mm) tubes at evaporation temperatures of -15 and -30°C. The measured results show that the nucleate boiling is a main heat transfer mechanism in the 6.1 mm …
-
Heat transfer performance and prediction of low global warming potential R134a refrigerant alternatives
… understanding of the flow condensation heat transfer performance of low GWP refrigerants such as R513A and R450A. Flow condensation data were extracted from 35 papers and created a database of 5,030 condensation heat transfer coefficient data points. The data points were compared to …
-
Enhanced condensation with active methods
… to reduce their thermal resistance and improve heat transfer coefficients. Interdigitated electrode patterns were fabricated on piezoelectric LiNbO3 wafers and SAW waves were generated with RF voltages in the 12.5 - 100 MHz regime. These were tested in the in-house condensation rig with Ethanol, …
-
Heat and mass transfer in bubble column dehumidifiers for HDH desalination
Heat and mass transfer processes governing the performance of bubble dehumidifier trays are studied in order to develop a predictive model and design rules for efficient and economical design of bubble column dehumidifiers for humidification-dehumidification (HDH) systems. As a result of their high …
-
The condensation of vapours of binary immiscible liquids
Heat transfer data are reported for the condensation of steam-toluene and steam-trichloroethylene eutectic mixtures on 25.4 mm diameter oxidised copper and gold plated horizontal tubes. Data are also presented for the condensation of pure steam, toluene and trichloroethylene on the oxidised copper …
-
Heat transfer measurements in film condensation of steam on small diameter horizontal tubes
Heat transfer coefficients were measured during film condensation of steam on horizontal tubes of 0.122, 0.182, 0.250, 0.375 inches in diameter. Scale effects were eliminated by repeated cleaning of the tubes. Filmwise, dropwise, mixed, and streaky condensation patterns of steam on the horizontal …
-
The quenching characteristics of sodium polyacrylate solutions.
… increasing concentration. The maximum surface heat transfer coefficients were significantly below those recorded in water or polyalkylene glycol solutions and decreased with increasing concentration. Just after the passage of this maximum the surface heat transfer coefficient declined rapidly …
-
A study of interfacial waves and heat transfer for turbulent condensation in vertical tubes
… made of the film characteristics and the local heat transfer coefficients for the downward flow of steam condensing in a vertical tube. The mass velocity of the steam was such that the flow occurred in the annular-mist regime. The interfacial wave velocities, frequencies, and amplitudes were …
-
Experimental Investigation of Dimples as a Heat Transfer Enhancement Feature in Narrow Diverging and Converging Channels
Detailed heat transfer coefficient distributions have been obtained for narrow converging and diverging channels with and without enhancement features. The enhancement feature considered for this study is dimples (inline and staggered) on the main heat transfer surfaces. All the measurements are …
-
Infrared Thermography Techniques for Flow Visualisation and Heat Transfer Coefficient Measurement
… component is critical for predicting loss and heat transfer in design. Despite this importance, practical computational methods that predict boundary layer state remain unreliable thanks to the sparse, scattered data on which they are tuned. There is a need for experimental methods that can …
-
Bubble behavior in subcooled flow boiling on surfaces of variable wettability
… management due to its potential for very high heat fluxes. By improving understanding of the conditions leading to bubble departure, surfaces can be designed that increase heat transfer coefficients in flow boiling. Bubbles were visualized during subcooled nucleate flow boiling of water on a …
Page 1 of 9