Library Catalogue

Library Catalogue

  • external user (warningwarning)
  • Log in as
  • About the Catalogue

    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104306
Title Onderzoekingen over de warmtedoorgang in een vertikale pijpverdamper
show extra info.
door J. Veldstra
Author(s) Veldstra, J.
Publisher Wageningen : [s.n.]
Publication year 1960
Description 84 p ill
Notes Proefschrift Wageningen
Tutors Leniger, Prof. Dr. Ir. H.A.
Graduation date 1960-07-01
Dissertation no. 283
Author abstract show abstract
The influences were investigated of various operating parameters on beat transmission, i.e. the evaporative capacity, in a single vertical evaporator tube, fed with pure water.

With natural circulation, temperature level and difference had a pronounced influence, especially at lower values of these parameters (e.g. boiling temperature 40°C, temperature difference 15°C). The heat transmission coefficient k increased for increasing temperature level as well as for increasing temperature difference.

The influence of the apparent liquid level was very important and was more pronounced for lower temperature levels and smaller differences. For each set of operating temperatures an apparent liquid level existed, for which k was maximum. The apparent liquid level had a very big influence on circulation rate. Forced circulation induced higher values of k only if the forced circulation rate was much higher than the natural one. Because natural circulation was slow for low temperatures and small differences forced circulation was found to be advantageous in these conditions.

With forced circulation the influence of temperature difference on k was small and sometimes reversed. Due to decreased viscosity, k was higher at higher temperatures. The most important influence on k was exerted by forced circulation rate.

With flash evaporation k was generally slightly smaller than with forced circulation, except at high circulation rates, where k became equal for both systems.

Online full textINTERNET
On paper FORUM ; STACKS ; 292G52
FORUM ; STACKS ; NN08202,283 ; Not for loan
Keyword(s) (cab) separation / heat treatment / thermodynamics / change of state / boiling point / dewpoint / heat transfer / heat / transmission / heat exchange
Categories Thermodynamics
Publication type PhD thesis
Language Dutch; Flemish
There are no comments yet. You can post the first one!
Post a comment

To support researchers to publish their research Open Access, deals have been negotiated with various publishers. Depending on the deal, a discount is provided for the author on the Article Processing Charges that need to be paid by the author to publish an article Open Access. A discount of 100% means that (after approval) the author does not have to pay Article Processing Charges.

For the approval of an Open Access deal for an article, the corresponding author of this article must be affiliated with Wageningen University & Research.

Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.