S-SS-1-1 Review of Methods of Donohue, Kern, Bell-Delaware and C.F. Braun

J. Taborek

Through the acquisition of the C. F. Braun shellside data and with the prospective addition of experimental results from our forthcoming work, HTRI is in the possession of the most complete set of data ever available. As the first logical step, and before engaging into major correlation work of our own, it appears justified to evaluate the presently available representative methods and correlations against this data.

A critical review of the selected methods to be evaluated is presented in this report as a necessary step to clarify terms and definitions and generally establish a well defined reference basis, so frequently omitted in evaluation work. The following methods are reviewed:

  1. The methods of Donohue and Kern are included as representative of the simple "integral" approach and, until recently, commonly used in the industry.
  2. The method of Bell, based on the Delaware work, is reviewed as representative of a new "evolutionary" approach of much better accuracy, but also manifold increased complexity. Some rearrangements of the Bell method are shown, resulting in greater clarity of presentation and ease of handling.

    The ideal tube bank j- and f-curves for 30, 45, 60 and 90° layouts, complete range of Reynolds numbers and p/d parameters were compiled and included as reference.

    The non-ideality correction factors are shown in graphical form and related to actual design parameter values for better "feel" of their magnitude and behavior.

  3. The C. F. Braun method as obtained by HTRI is abstracted from the reports and compared to the Bell method, on which it is based. The results point out several areas where the Bell method needed improvement or recorrelation as evidence from the CFB data sets.

Tinker's method was omitted from this review, but should be dealt with in one of our subsequent reports.