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Monday, May 11, 2020 | History

2 edition of On the effect of helical-flow inserts on boiling pressure drop found in the catalog.

On the effect of helical-flow inserts on boiling pressure drop

J.R Stone

On the effect of helical-flow inserts on boiling pressure drop

by J.R Stone

  • 111 Want to read
  • 27 Currently reading

Published .
Written in English


Edition Notes

StatementJ.R. Stone.
SeriesNASA-TM-X-52660, N70-23203
ID Numbers
Open LibraryOL19299724M

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On the effect of helical-flow inserts on boiling pressure drop by J.R Stone Download PDF EPUB FB2

Studied for variation of Reynolds numbers. The results show that the pressure drop is about –6, Nm −2 for hot fluid and –3, Nm overall. The HPHE illustrates evidently high comprehensive performance; effectiveness reach about for Re h = 2, and Re c = 1, and pitch ratio = with significant.

The results showed: (1) In the turbulent flow region, fin height had the greatest effect, helix angle had only a minor effect, and the number of grooves had almost no effect upon the pressure drop. A.E. Bergles's research works with 6, citations and 7, reads, including: Investigation of CaCO3 fouling in plate heat exchangers.

For clarity, we have selected some brief investigation observations made by Mizushina et al., who performed experimental works on the effect of radial electric field on heat transfer and longitudinal pressure drop of laminar flow in a concentric annular passage using dielectric organic liquid.

Apparently heat transfer increased with increasing Cited by: THE ROLE OF EXPERIMENTS IN TWO-PHASE SYSTEMS WITH PARTICULAR REFERENCE TO MEASUREMENT TECHNIQUES these are of direct relevance in design and can be divided into primary design factors such as pressure drop and heat-transfer coefficient and secondary design factors such as flow distribution and stability.

Previous chapter in book;Cited by: Due to the extended geometry of internally rifled tubes with helical ribs, the rate of convective heat transfer within them is much higher compared to smooth tubes. Simultaneously, a rise in the contact surface area between the fluid and the solid body increases the friction factor.

This paper presents the results of experimental testing performed to determine the friction factor in an Cited by: 2. A similar set of calculations may be done for the shell side pressure drop thus giving the green curve. Immediately we see that the tube side pressure drop is no longer having an effect on the design in this case.

Hence we might be able to improve the design by introducing tube side enhancement of increasing the number of tube side passes. EPA/ May A Manual for the Use of Electrostatic Precipitators to Collect Fly Ash Particles by Jack R. McDonald and Alan H Dean Southern Research Institute Ninth Avenue, South Birmingham, Alabama Contract No.

Task No. 7 Program Element No EHE EPA Project Officer Leslie E. Sparks Industrial Environmental Research Laboratory Office of Environmental. The boiling point in the tubes of such an evaporator is higher than in the vapor head because of both frictional-pressure drop and the head needed to accelerate the vapor to the tube-exit velocity.

These factors, which can easily be predicted, make the overall apparent coefficients somewhat lower than those for nonboiling conditions. This banner text can have markup. web; books; video; audio; software; images; Toggle navigation.

Operating Heat duty U (Overall heat transfer coefficient) is calculated and monitored Example Kerosene (shell) / Crude oil (tube) HX ref DQ kern Page Data In Shell or tube Hot fluid Kerosene S (Enter S if in shell) (Enter T if in tube) Cold fluid Crude oil T (Enter S if in shell) (Enter T if in tube) Shell side data Kerosene inlet temp 5/5(2).

Biblioteca en línea. Materiales de aprendizaje gratuitos. Ninguna Categoria; Subido por delvis Heat Exchanger Design Handbook, 2nd Ed (1). Full text of "The Cb-1Zr Rankine System Corrosion Test Loop" See other formats. The objective of the present paper is that the study of gas solid behaviour in MW CFB riser by using mathematical equations.

In this study, the key parameters of hydrodynamics (suspension density, local voidage, pressure drop) which are affecting the design and performance of CFB boiler are studied at different height levels of riser.

Normally, a pressure drop of kg/cm2 per shell is permitted for liquid streams. If there are five such preheat exchangers, a total pressure drop of kg/cm2 for the circuit would be permitted. If the pressure drop through two of these exchangers turns out to be only kg/cm2, the balance of kg/cm2 would be available for the other three.5/5(15).

The distinguishing feature between the swirl tape configuration and the helical vane configuration is that in the latter case there is a single helical flow passage which would appear to be more amenable to analysis and would, perhaps, be charac- terized by a smaller pressure drop.

PREFACE. The Department of Mechanical Engineering, SRM IST is proud to bring out the proceedings of the 2 nd International Conference on Advances in Mechanical Engineering (ICAME. ph Atmospheric pressure at height h p0 Atmospheric pressure at sea level = 1, mbar orPa g Acceleration of gravity = m s-2 0 Density of air at sea level at 0 C = kg m-3 If for the purposes of simplification we assume that the density of the air, the acceleration of gravity and atmospheric pressure at sea level are 5/5(1).

AbstractIn this paper, a numerical investigation on heat transfer enhancement and flow characteristics in a new type plate heat exchanger using helical flow duct in a series arrangement in counter flow of water as the test fluid is presented.

Computational fluid dynamics package (ANSYS CFX ) is used. Helical plate with different pitch ratios and different flow channel cross section aspect Cited by: 3.

Normally, a pressure drop of kg/cm2 per shell is permitted for liquid streams. If there are five such preheat exchangers, a total pressure drop of kg/cm2 for the circuit would be permitted.

If the pressure drop through two of these exchangers turns out to be only kg/cm2, the balance of kg/cm2 would be available for the other three.

The direction of the energy is from the medium to the surfaces, and so the net heat flux on the walls has a negative sign. The maximum heat flux occurs at the center of the surfaces, where the effect of the medium is the greatest, and then it decreases towards the corners, where the effect of the cold walls become more relevant.Medium vacuum ×absolute pressure 1 to 2 bar ×system gauge pressure Above 10 bar ×system gauge pressure When a high-pressure drop is utilized, care must be taken to ensure that the resulting high fluid velocity does not cause erosion or flow -induced tube vibration.

Value for controlling flow of cryogenic fluid. DOEpatents. Knapp, Philip A. A valve is provided for accurately controlling the flow of cryogenic fluids such as liquid nitrogen.

The valve comprises a combination of disc and needle valves affixed to a valve stem in such a manner that the disc and needle are free to rotate about the stem, but are constrained in lateral and vertical.