Download Convective Boiling and Condensation by Sander L. Gilman, David J. Parent PDF

By Sander L. Gilman, David J. Parent

On its unique book in 1973, this booklet was once the 1st reference for engineers to completely current the technological know-how of boiling and condensation. It dealt in particular with the issues of estimating warmth move premiums and strain drops, with specific realization to the prevalence of boiling and condensation within the presence of pressured flows inside pipes. the recent 3rd variation covers fresh advances and considerably extends assurance to flows over tube bundles, with huge new remedy of two-phase warmth move concerning refrigerants and petrochemicals. Many new difficulties were further on the finish of every bankruptcy to augment the book's use as a textual content in complicated classes on two-phase circulation and warmth move. The ebook is written essentially for layout and improvement engineers within the chemical strategy, energy new release, and refrigeration industries, and is intended to be an reduction within the layout of warmth exchangers. teachers utilizing the ebook as a direction textual content may possibly receive complete strategies to the end-of-chapter difficulties by means of writing to: technological know-how advertising Dept., Oxford college Press, 198 Madison Ave., long island, new york 10016 (please comprise institution identify and direction identification).

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Additional resources for Convective Boiling and Condensation

Sample text

63) factor used in Baker flow pattern chart eq. ( 1 . 1 8) half apex angle of a fin Introduced in Chapter 7, 1 2 10 12 deg deg 11 xxxix NOTATION Symbol '" '" "'eHF n n OJ Description parameter used in Chisholm correlation eq. 73) parameter used in eq. (dpjdz F }f (dpjdz F}fo (dpjdz F} g (dpjdz F) go (dpjdz}SCB (dpjdz a) (dpjdzJF) (dpjdz}�o (dpjdz gF) British eng. 40) Ahmed's critical heat flux parameter 9 mass velocity correction factor in Baroczy correlation parameter appearing in eq. 8) angular rotation 2 Gradients and differences (dpjdz) (dpjdz F ) SI units pressure gradient pressure gradient due to friction frictional pressure gradient assuming liquid alone flow frictional pressure gradient assuming total flow to be liquid frictional pressure gradient assuming gas alone flow frictional pressure gradient assuming total flow to be gas pressure gradient in subcooled boiling pressure gradient due to acceleration pressure gradient due to friction in liquid phase pressure gradient for total flow assumed liquid at same heat flux, velocity and temperature pressure gradient due to friction in gas phase NjA in - 1 9 radjs radjs 11 Njm 2 m Njm 2 m pdljft 2 ft pdljft 2 ft 2 Njm 2 m pdljft 2 ft 1, 2 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 1, 2 Njm 2 m pdljft 2 ft 3 Njm 2 m pdljft 2 ft 6 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 6 Njm 2 m pdljft 2 ft 2 (Continued) xl NOTATION Symbol Description SI units British eng.

40) Ahmed's critical heat flux parameter 9 mass velocity correction factor in Baroczy correlation parameter appearing in eq. 8) angular rotation 2 Gradients and differences (dpjdz) (dpjdz F ) SI units pressure gradient pressure gradient due to friction frictional pressure gradient assuming liquid alone flow frictional pressure gradient assuming total flow to be liquid frictional pressure gradient assuming gas alone flow frictional pressure gradient assuming total flow to be gas pressure gradient in subcooled boiling pressure gradient due to acceleration pressure gradient due to friction in liquid phase pressure gradient for total flow assumed liquid at same heat flux, velocity and temperature pressure gradient due to friction in gas phase NjA in - 1 9 radjs radjs 11 Njm 2 m Njm 2 m pdljft 2 ft pdljft 2 ft 2 Njm 2 m pdljft 2 ft 1, 2 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 1, 2 Njm 2 m pdljft 2 ft 3 Njm 2 m pdljft 2 ft 6 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 2 Njm 2 m pdljft 2 ft 6 Njm 2 m pdljft 2 ft 2 (Continued) xl NOTATION Symbol Description SI units British eng.

Important points to note from a heat transfer viewpoint are the possibility of intermittent drying and rewetting of the upper surfaces of the tube in slug and wavy flow and the progressive drying out over long tube lengths of the upper circumference of the tube wall in annular flow. At higher inlet liquid velocities the influence of gravity is less obvious, the phase distribution becomes more symmetrical and the flow patterns become closer to those seen in vertical flow. 4(b) and (c) illustrate the flow patterns existing in condensation inside horizontal tubes (Schliinder 1983).

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