A study of nucleate boiling in a liquid flowing through a vertical tube PDF Download
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Author: David Edward Minns
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: David Edward Minns
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Gerhard O. Mueller
Publisher:
ISBN:
Category : Nucleate boiling
Languages : en
Pages : 196
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Author: Gil Takeshi Yamashiro
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 168
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Author: Robert Siegel
Publisher:
ISBN:
Category : Film boiling
Languages : en
Pages : 48
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Book Description
Nucleate boiling was studied experimentally from electrically heated horizontal and vertical wires (0.0197-in. diam.) in water, ethyl alcohol, and 60-percent-by-weight aqueous sucrose solution in gravity fields of 0.014 and 1.0 times Earth gravity. The fluids were at their saturation temperatures at atmospheric pressure. The gravity reduction to 0.014 times Earth gravity caused a shift of only a few degrees in the curve of heat flux as a function of the difference between surface and saturation temperatures. Film boiling of ethyl alcohol was observed at Earth gravity and at several reduced gravity fields down to 0.014 times Earth gravity. For both the horizontal and vertical orientations, the gravity field and the circumferential surface tension at the interface of the vapor film surrounding the thin wire proved to be very important for the determination of the vapor removal pattern. As gravity was reduced, the vapor film behavior for the vertical orientation approached that for the horizontal position. A motion picture film is available that illustrates the boiling behavior in reduced gravity.
Author: Satish Kandlikar
Publisher: Elsevier
ISBN: 9780080445274
Category : Science
Languages : en
Pages : 492
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Book Description
&Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Author: S.G. Kandlikar
Publisher: Routledge
ISBN: 1351442198
Category : Science
Languages : en
Pages : 786
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Book Description
Provides a comprehensive coverage of the basic phenomena. It contains twenty-five chapters which cover different aspects of boiling and condensation. First the specific topic or phenomenon is described, followed by a brief survey of previous work, a phenomenological model based on current understanding, and finally a set of recommended design equa
Author: John G. Collier
Publisher: Clarendon Press
ISBN: 0191591262
Category :
Languages : en
Pages : 646
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Book Description
* Third edition of a well-known and well established text both in industry and for teaching * Fully up-to-date and includes extra problems This book is an aid to heat exchanger design written primarily for design and development engineers in the chemical process, power generation, and refrigeration industries. It provides a comprehensive reference on two-phase flows, boiling, and condensation. The text covers all the latest advances like flows over tube bundles and two-phase heat transfer regarding refrigerants and petrochemicals. Another feature of this third edition is many new problems at chapter ends to enhance its use as a teaching text for graduate and post-graduate courses on two-phase flow and heat transfer. - ;This book is written for practising engineers as a comprehensive reference on two-phase flows, boiling, and condensation. It deals with methods for estimating two-phase flow pressure drops and heat transfer rates. It is a well-known reference book in its third edition and is also used as a text for advanced university courses. Both authors write from practical experience as both are professional engineers. -
Author: Lounes Oufer
Publisher:
ISBN:
Category : Nucleate boiling
Languages : en
Pages : 184
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Book Description
A study of nucleate boiling of water, four alcohols and three ethanol-water mixtures was conducted in a vertical thermosiphon reboiler. The test section consisted of a 1/2- inch diameter electrically heated stainless-steel rod jacketed by a 15-inch long pyrex glass tube. Two different inside diameters of the glass tube corresponding respectively to annuli of equivalent diameters 0.225 and 0.750 inch were used. The purpose of the study was to investigate whether or not there was an effect of the annulus gap on heat transfer to the boiling liquids. Heat fluxes ranged from 17,000 to 91,000 Btu/hr.ft2. Velocities were measured in an attempt to simulate the natural-circulation data by means of a micro-pump and a rotameter. The velocities so determined varied from 0.093 to 1.171 ft/sec. Calculations have shown wall superheats (wall-minus-saturation temperature) from 17.4 to 58.6°F, vapor qualities from 0.9 to 7.6% and heat transfer coefficients from 518 to 2473 Btu/hr.ft2. °F. An equation expressing the relationship between the heat flux and the wall superheat raised to a power n was developed for each fluid-diameter combination following a statistical analysis of the data. It was observed that for each fluid, the value of the exponent n was less for the smaller diameter of the annulus and approached a value of three for the larger diameter. This was attributed to a much lower contribution of the convective heat transfer component compared to the nucleate boiling heat transfer component for the larger tube. It was also observed that for the pure organic liquids, no significant effect of the diameter was observed whereas for water an increase in the annular width noticeably decreased the heat transfer coefficient at a given degree of saturation. For ethanol-water mixtures, it was observed particularly at high heat flow rates, that the diameter effect tended to disappear as the weight fraction of ethanol in the solution was increased. However, although consistent within itself, this result probably needs further investigation. To check the validity of the experimental data, comparisons were made with two commonly used equations in boiling heat transfer: Chen's correlation and Rohsenow's correlation. It was found that Chen's correlation usually predicted higher heat transfer rates than the experimental values. On the other hand, Rohsenow's correlation mostly predicted lower heat fluxes at De = 0.225 inch and mostly higher heat fluxes at De = 0.750 inch than the experimental data. Mean deviations for Rohsenow's equation were always lower than those from Chen's equation for both diameter sizes.
Author: D. G. Thomas
Publisher:
ISBN:
Category : Nuclear reactions
Languages : en
Pages : 32
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Author: John W. Schaefer
Publisher:
ISBN:
Category : Heat flux
Languages : en
Pages : 52
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Book Description
