Download or read book The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments, under different conditions, were conducted to evaluate the effect of condensate inundation on condensation heat transfer in tube bundles of marine condensers. Five 15.9 mm. (5/8 in) nominal outside diameter, smooth stainless steel tubes were used in a vertical row to simulate an actual condenser. Tubes were located in an equilaterial triangular array with a spacing-to-diameter ratio of 1.5. Heat transfer performance was determined for each tube in bundle. Data was taken for condensing steam on the outside of each tube at about 21 KPa (3 psia) and at about 101 KPa (14.7 psia). Each tube was cooled by water on the inside at velocities of 0.78 to 6.22 m/sec (2.56 ft/sec to 20.42 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the first three tubes in portions of the condenser under all conditions tested. Side drainage occurred only over the third and fourth tubes at a condensation pressure of about 21 KPa. The dominate mode of the flow at 101 KPa condensation pressure was gravitational flow. Outside heat transfer coefficients were higher than expected under all conditions when compared to the Nusselt theory. The reason for this is possibly due to secondary vapor flow. Recommendations to improve validations are provided. (Author).
Download or read book The Effect of Condensate Inundation on Condensation Heat Transfer in Tube Bundles of Marine Condensers written by Ismail Demirel and published by . This book was released on 1980 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments, under different conditions, were conducted to evaluate the effect of condensate inundation on condensation heat transfer in tube bundles of marine condensers. Five 15.9 mm. (5/8 in) nominal outside diameter, smooth stainless steel tubes were used in a vertical row to simulate an actual condenser. Tubes were located in an equilaterial triangular array with a spacing-to-diameter ratio of 1.5. Heat transfer performance was determined for each tube in bundle. Data was taken for condensing steam on the outside of each tube at about 21 KPa (3 psia) and at about 101 KPa (14.7 psia). Each tube was cooled by water on the inside at velocities of 0.78 to 6.22 m/sec (2.56 ft/sec to 20.42 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the first three tubes in portions of the condenser under all conditions tested. Side drainage occurred only over the third and fourth tubes at a condensation pressure of about 21 KPa. The dominate mode of the flow at 101 KPa condensation pressure was gravitational flow. Outside heat transfer coefficients were higher than expected under all conditions when compared to the Nusselt theory. The reason for this is possibly due to secondary vapor flow. Recommendations to improve validations are provided. (Author).
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer in a Tube Bundle written by S. K. Brower and published by . This book was released on 1985 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam-condensation heat-transfer measurements were made using a 5-tube in-line test condenser with an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes wire-wrapped tubes and dropwise-coated tubes. The average outside heat-transfer coefficient for 30 smooth tubes was 0.64 times the Nusselt coefficient fo the first tube. A total of eight wire-diameter and wire-pitch combinations were tested: 1.6-mm-diameter wire wrapped at 16 mm, 7.6 mm and 4 mm wire pitches, 1.0-mm-diameter wire wrapped at 8 mm, 4 mm and 2 mm wire pitches, and 0.5-mm-diameter wire wrapped at 4 and 2 mm wire pitches. The best bundle performance was obtained when the tubewere wrapped with 1.0-mm-diameter wire at a wire pitch of 4 mm. This combination resulted in an average outside heat-transfer coefficient for 30 tubes that was 1.15 times the value computed for the first time using the Nusselt theory. The average outside heat-transfer coefficient for 30 dropwise-coated tubes was 1.1 times the value of the heat-transfer coefficient for the first tube in the tube bundle. Using either wire-wrapped tubes or dropwise-coated tubes, it is possible to significantly reduce the condenser surface area and overall size. Keywords: Inundation, Smooth, wire-wrapped tubes. (Theses).
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire Wrapped Tubing written by and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam condensation heat transfer measurements were made in a 5-tube test condenser having an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes and roped tubes wrapped with wire. A Sieder-Tate equation was used to correlate the inside heat-transfer coefficient. For smooth tubes, a leading coefficient of 0.029 was found, while it was 0.061 for the roped tubes. The average condensing coefficient measured for 30 smooth tubes was 0.59 times the Nusselt coefficient calculated for the first tube. When the smooth tubes were wrapped with wire, this ratio increased up to 0.86. Further, roped tubes without wire experienced a ratio of 0.63, while roped tubes wrapped with wire resulted in a ratio of 0.86. These preliminary data show that wire-wrapped tubes may lead to a significant reduction in condenser surface area. (Author).
Download or read book Condensation and Condenser Design written by J. Taborek and published by American Society of Mechanical Engineers. This book was released on 1993 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Condensate Inundation on Steam Condensation Heat Transfer to Wire Wrapped Tubing written by Georgios Dimitriou Kanakis and published by . This book was released on 1983 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steam condensation heat transfer measurements were made in a 5-tube test condenser having an additional perforated tube to simulate up to 30 active tubes. Results were obtained for smooth tubes and roped tubes wrapped with wire. A Sieder-Tate equation was used to correlate the inside heat-transfer coefficient. For smooth tubes, a leading coefficient of 0.029 was found, while it was 0.061 for the roped tubes. The average condensing coefficient measured for 30 smooth tubes was 0.59 times the Nusselt coefficient calculated for the first tube. When the smooth tubes were wrapped with wire, this ratio increased up to 0.86. Further, roped tubes without wire experienced a ratio of 0.63, while roped tubes wrapped with wire resulted in a ratio of 0.86. These preliminary data show that wire-wrapped tubes may lead to a significant reduction in condenser surface area. (Author).
Download or read book Effects of Condensate Inundation and Vapor Velocity on Heat Transfer in a Condenser Tube Bundle written by Paul Jeffrey Noftz and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A five-tube column test condenser was modified to facilitate easier tube removal and installation and to allow for the simulation of larger depth tube bundles. Heat transfer coefficients were then determined for sixty-two runs conducted at steam supply pressures of 35, 40, 45, and 50 psig with the system operated at test condenser pressures of approximately 2 and 15 psia. Each run was five minutes long with temperature, pressure, and flow rate data taken at one minute intervals. The results revealed that the average tube wall temperature and the heat transfer coefficients for a given tube of a tube bundle increased as the mean vapor velocity increased, but decreased as the amount of condensate inundation increased. The experimentally obtained values for the heat transfer coefficients were compatible with the Nusselt predictions for the runs conducted at 15 psia, but greatly exceeded the Nusselt predictions for the runs conducted at 2 psia. However, for the 2 psia runs, the heat transfer coefficients for the top tubes agreed closely with an experimental correlation proposed by Fujii. The simulation of a tube bundle of more than five active tubes per column at the 2 psia test condenser pressure demonstrated heat transfer coefficients closer to the Nusselt theory than when only five active tubes were considered.
Download or read book An Experimental Investigation of the Effect of Condensate Inundation on Heat Transfer in a Horizontal Tube Bundle written by Donald Eugene Eshleman and published by . This book was released on 1980 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test facility to evaluate the effect of condensate inundation on heat transfer within a horizontal tube bundle was designed, constructed and validated. Five 15.9 mm (5/8 in.) nominal outside diameter, smooth stainless steel tubes were utilized in a vertical row. They were located in an equilateral triangular array with a spacing to diameter ratio of 1.5. Heat transfer performance was determined for each tube in the bundle. Data was taken by condensing steam at about 21 kPa (3 psia) on the outside of each tube. Each tube was cooled by water on the inside at velocities of 0.78 to 7.0 m/sec (2.56 to 23 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the tube in portions of the condenser as well as side drainage, particularly over the first three tubes. Outside heat transfer coefficients were lower than expected when compared to Nusselt theory, possibly due to the effects of secondary vapor flow and/or non-condensable gases. Recommendations to improve validation are provided. (Author).
Download or read book An Experimental Investigation of the Effect of Condensate Inundation on Heat Transfer in a Horizontal Tube Bundle written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test facility to evaluate the effect of condensate inundation on heat transfer within a horizontal tube bundle was designed, constructed and validated. Five 15.9 mm (5/8 in.) nominal outside diameter, smooth stainless steel tubes were utilized in a vertical row. They were located in an equilateral triangular array with a spacing to diameter ratio of 1.5. Heat transfer performance was determined for each tube in the bundle. Data was taken by condensing steam at about 21 kPa (3 psia) on the outside of each tube. Each tube was cooled by water on the inside at velocities of 0.78 to 7.0 m/sec (2.56 to 23 ft/sec). The overall heat transfer coefficient was determined directly from experimental data. The inside and outside heat transfer coefficients were determined using the Wilson plot technique. Observation of condensate flow showed lateral droplet motion along the tube in portions of the condenser as well as side drainage, particularly over the first three tubes. Outside heat transfer coefficients were lower than expected when compared to Nusselt theory, possibly due to the effects of secondary vapor flow and/or non-condensable gases. Recommendations to improve validation are provided. (Author).
Download or read book Power Condenser Heat Transfer Technology written by P. J. Marto and published by Hemisphere Pub. This book was released on 1981 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Condensers Theory and Practice written by David Butterworth and published by Thomas Telford Publishing. This book was released on 1983 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Test Condenser to Measure Condensate Inundation Effects in a Tube Bundle written by Roger Harold Morrison and published by . This book was released on 1981 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: A test condenser was designed and constructed to provide a means to evaluate the effects of condensate inundation on enhanced condenser tubing. Fifteen horizontal tubes were used to form a square inline tube matrix three tubes across and five tubes high with a spacing to diameter ration of 1.5. The center column of active tubes was made of 16 mm O.D. half hard copper. They were flanked by full round 16 mm O.D. stainless stell dummy tubes. Smooth tubes were utilized to validate the operation of the system. A new method of data reduction was developed to increase experimental accuracy. This was accomplished by measuring actual tube wall surface temperatures so that the steam side heat transfer coefficient could be calculated directly. This approach replaces the complexity and inaccuracies of the Wilson Plot technique. Validation of system operation was accomplished using steam at 253 mm Hg absolute. Recommendations to improve the test condenser are provided. (Author).
Download or read book The Principles and Practice of Heat Transfer written by Ali H. Tarrad and published by Cambridge Scholars Publishing. This book was released on 2022-12-21 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: The imminent need to mitigate the global warming potential (GWP) and the impact of the ozone depletion potential (ODP) demand seeking more efficient uses of energy, new energy sources, and new technologies. Heat transfer plays a vital role in efficient power production with minimum investment, installation, and maintenance costs. This book deals with issues related to efficiently utilizing available energy by integrating the technology of heat exchangers into power production units. Further, it provides detailed descriptions of heat transfer applications commonly used in modern everyday life and industrial contexts, supported by practical and worked-out examples presented to facilitate learning.
Download or read book A Critical Review of Heat Transfer Enhancement Techniques for Use in Marine Condensers written by Paul J. Marto and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of heat transfer enhancement techniques are reviewed and evaluated for use in marine condensers. This review includes tube-side enhancement, as well as shell-side enhancement techniques. At present, the most promising technique to enhance heat transfer on the tube side is with one of the commercially available, mildly indented, corrugated tubes. With this type of tube, the shell-side heat transfer enhancement is not as large and is uncertain due to the, as yet determined, complex effects of vapor shear and condensate inundation. Large bundle tests with enhanced tubing are therefore required before the details of tube-to-tube interaction will be fully understood. (Author).
Download or read book A Critical Review of Heat Transfer Enhancement Techniques for Use in Marine Condensers written by Paul J. Marto and published by . This book was released on 1982 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of heat transfer enhancement techniques are reviewed and evaluated for use in marine condensers. This review includes tube-side enhancement, as well as shell-side enhancement techniques. At present, the most promising technique to enhance heat transfer on the tube side is with one of the commercially available, mildly indented, corrugated tubes. With this type of tube, the shell-side heat transfer enhancement is not as large and is uncertain due to the, as yet determined, complex effects of vapor shear and condensate inundation. Large bundle tests with enhanced tubing are therefore required before the details of tube-to-tube interaction will be fully understood. (Author).
Download or read book Condensation Heat Transfer Enhancement written by V. G. Rifert and published by WIT Press (UK). This book was released on 2004 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: In processes with condensation of steam-to-gas compositions or refrigerative agents an intensification of condensation is often required because thermal resistance on the condensation side can be greater than the thermal resistance of the heat transfer wall on the cooling side. In this work, a pair of researchers from the National Technical U. of Ukraine and the State Academy of Refrigeration (Ukraine) provide information about the enhancement of condensation, including research results from the former USSR they feel deserves wider dissemination as well as discussion of different theoretical models of the condensation process. The US office of WIT Press is Computational Mechanics. Annotation : 2004 Book News, Inc., Portland, OR (booknews.com).
