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Thursday, July 23, 2020 | History

4 edition of Unsteady heat and mass transfer in helical tube bundles found in the catalog.

Unsteady heat and mass transfer in helical tube bundles

B. V. DziНЎubenko

Unsteady heat and mass transfer in helical tube bundles

by B. V. DziНЎubenko

  • 173 Want to read
  • 7 Currently reading

Published by Hemisphere Pub. Corp. in New York .
Written in English

    Subjects:
  • Heat -- Transmission.,
  • Mass transfer.,
  • Tubes -- Fluid dynamics.

  • Edition Notes

    StatementB.V. Dzyubenko, G.A. Dreitser, L.-V.A. Ashmantas.
    ContributionsDreĭt͡ser, Genrikh Aleksandrovich., Ashmantas, L.-V. A.
    Classifications
    LC ClassificationsQC320 .D9813 1990
    The Physical Object
    Paginationxvi, 225 p. :
    Number of Pages225
    ID Numbers
    Open LibraryOL2226617M
    ISBN 100891168842
    LC Control Number89071654

    The overall heat transfer surface area was determined based on the tube diameter and developed area of heat transfer which is A= m 2, The total convective area of the tube keep constant for two geometry of coiled heat exchanger. The total heat transfer rate from the tube bank depends upon the average heat transfer coefficient, the total surface area for heat transfer, and the inlet and outlet air temper-atures, given by: Q ¼ hðNpDLÞDT lm ð10Þ where h is the average heat transfer coefficient, N is the to-tal number of tubes and DT lm is the log mean temperature.

    Y. X. Lai, Analysis on dynamic characteristic and flow induced vibration of heat exchanger tube bundles [Doctor thesis], Nanjing University of Technology, M. P. Paidoussis, D. Mavriplis, and S. J. Price, “A potential flow theory for the dynamics of cylinder arrays in cross flow,” Journal of Fluid Mechanics, vol. , pp. –, Cited by: 1. Unsteady Heat Transfer Many heat transfer problems require the understanding of the complete time history of the temperature variation. For example, in metallurgy, the heat treating process can be controlled to directly affect the characteristics of the processed materials. Annealing (slow cool) can soften metals and improve ductility.

    Heat and Mass Transfer book. Read 5 reviews from the world's largest community for readers. With complete coverage of the basic principles of heat transf /5. Analysis of Unsteady Tip and Endwall Heat Transfer in a Highly Loaded Transonic Turbine Stage Vikram Shyam National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio Ali Ameri and Jen-Ping Chen The Ohio State University Columbus, Ohio Abstract In a previous study, vane-rotor shock interactions andFile Size: 1MB.


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Unsteady heat and mass transfer in helical tube bundles by B. V. DziНЎubenko Download PDF EPUB FB2

This considers unsteady heat and mass transfer in helical tube bundles, the optimum use of which is necessary for minimizing size and mass of heat exchangers used in various industries.

Rating: (not yet rated) 0 with reviews - Be the first. It has been widely reported in literature that heat transfer rates in helical coils are higher as compared to a straight tube. Due to the compact structure and high heat transfer coefficient, helical coil heat exchangers are widely used.

Bai et al., ;[1].File Size: KB. ME Heat Transfer 4 19 Specific Problem • Problem: at t = 0, a large slab initially at T i is placed in a medium at temperature T∞ with a heat transfer coefficient, h • Coordinates: Choose x = 0 as center of slab (which runs from –L to L) for this Figure (a) in symmetric problem Çengel, Heat and Mass Transfer 20 Specific Problem IIFile Size: KB.

Advanced Heat and Mass Transfer by Amir Faghri, Yuwen Zhang, and John R. Howell Unsteady State Heat Conduction 2 Consider an arbitrarily shaped object with volume V, surface area As, and a uniform initial temperature of Ti as shown in Fig. At time t = 0, the arbitrarily shaped object is exposed to a fluid with temperature of T∞and.

Int J Heat Mass Transfer 41(14)– CrossRef Google Scholar 7. Ali ME () Free convection heat transfer from the outer surface of vertically oriented helical coils in Cited by: The heat-transfer factors j, k (unprimed) are Pr-independent.

Primed values j', k' indicate that the influence of property variations across the boundary layer has also been taken into consideration. The Delaware group chose n = 1/3, i.e., j is the so-called Colburn heat transfer () and Žukauskas and Ulinskas () propose similar, but slightly higher, values n = and 0.

This broad-based book covers the three major areas of Chemical Engineering. Most of the books in the market involve one of the individual areas, namely, Fluid Mechanics, Heat Transfer or Mass Transfer, rather than all the three. This book presents this material in a single by: •It can be used practically in heat transfer for a relatively short time and/or in a relatively thick material •The governing equation with no bulk flow and no heat generation is •The boundary conditions are •The initial condition is 2 2 x T t T T x 0 T s T x T i T t 0 T iFile Size: 1MB.

important role in heat transfer coefficient in helical coil heat exchanger. Mass flow rate Again from the analytical analysis it is shown by the graph that heat transfer coefficient is directly proportional mass flow rate.

Apart from experimental and analytical analysis result show expected value of heat transfer coefficient for helical. This study addresses heat transfer performance of various configurations of coiled non-circular tubes, e.g., in-plane spiral ducts, helical spiral ducts, and conical spiral ducts.

The laminar flow of a Newtonian fluid in helical coils made of square cross section tubes is simulated using the computational fluid dynamic approach. The effects of tube Reynolds number, fluid Prandtl number, coil Cited by: HEAT TRANSFER IN SERRATED-FIN TUBE BUNDLES WITH STAGGERED TUBE.

LAYOUTS. Method for Heat Transfer Calculation of Helical-Wound Fin Tubes, ASME,Pet. January Heat and Mass : Erling Næss. Natural convection heat transfer from helical coiled tubes was experimentally investigated by [13]. It was found that the prediction procedure used in this study shows promise as a method of.

Proceedings of the 3rd International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT’16) Ottawa, Canada – May 2 – 3, Paper No. Spiral Coil Heat Exchanger- Experimental Study Esam Jassim Prince Mohammed Bin Fahd University (PMU) P.O.

BoxKhobar, Saudi Arabia [email protected] Size: KB. Handbook of Heat and Mass Transfer: Catalysis, Kinetics and Reactor Engineering [Cheremisinoff, Nicholas P.] on *FREE* shipping on qualifying offers.

Handbook of Heat and Mass Transfer: Catalysis, Kinetics and Reactor EngineeringAuthor: Nicholas P. Cheremisinoff. (3) h tp h st = C 1 1 χ tt C 2 where h tp and h st are the convective heat transfer coefficients for two-phase and single-phase flow in a helical tube with a tube diameter of mm.

C 1 and C 2 are empirical constants, and respectively, for experimental conditions with: steam quality in the range of 0–1, system pressure in the Cited by: S.

Rahul, S.K. Gupta, P.M.V. Subbarao, An experimental study for estimating heat transfer coefficient from coil tube surfaces in cross flow of air, in: Proceedings of the Third ISHMT – ASME Heat and Mass Transfer Conference, DecemberIndia, pp.

–Cited by: The paper is based on the analysis of unsteady heat conduction through short fin with applicability of quasi theory. “The area exposed to the surrounding is frequently increased by the attachment of protrusions to the surfaces, and the arrangement provides a means by which heat transfer rate can be substantially Size: KB.

In Fig. 1 the layout of the test facility for heat transfer and pressure drop measurements at finned- tube bundles in cross-flow is shown. This test 6th IASME/WSEAS International Conference on HEAT TRANSFER, THERMAL ENGINEERING and ENVIRONMENT (HTE'08) Rhodes, Greece, AugustISSN: ISBN: File Size: KB.

showing the improvement in heat transfer through helical coils. On an average heat transfer rate for the helical coil increases by 11% when the mass flow rate was increased from to It can be observed that for higher mass flow rate, heat transfer increases but the temperature drop decreases.

This may be attributed due to the less. What is Unsteady State Heat Transfer. Heat transfer is the transfer of thermal energy from a body, at a high temperature, to another at a lower temperature. This transfer of thermal energy may occur under steady or unsteady state conditions.

Under Steady state conditions the temperature within the system does not change with time. The paper presents the numerical study of heat and mass transfer analysis in a viscous unsteady MHD nanofluid flow through a channel with porous walls and medium in the presence of metallic nanoparticles.

The two cases for effective thermal conductivity are discussed in the analysis through H-C model. The impacts of the governing parameters on the flow, heat and mass transfer Cited by: 5.Tube banks are commonly-employed design elements in heat exchangers.

Both plain and finned tube banks are widely found. Tube bundles are a sub-component in shell-and-tube heat exchangers, where the flow resembles crossflow at some places, and longitudinal flow elsewhere.pulsating heat transfer of laminar flow in a helical tube.

The study is performed to study the effect of pulsation amplitude and frequency and helical tube characteristics on the flow field and heat transfer. 2. Numerical simulation Mathematical Model As shown in figure 1 flow enters the domain from left side.