configuration. When the same pumps were used in an even larger unit, a slightly lower total power figure was obtained. The data recorded for the 30,000 GPD unit are representative of conditions at the end of over 2000 operating hours. The data fairly represent the running record with two exceptions. First, during 90% of the operating time the apparent stack resistance was 15% lower than at the end and, second, the current efficiency average over 2000 hr was 85.6 __+ 2%. Allowing for these two factors brings the estimated minimum power to 1.00 kwhr/1000 gal in good agreement with the figure found in operations with the 6000 GPD unit.
Conclusions and RecommendationsA self-contained device for the acidification of desalination plant feed streams has been developed. The acid generator requires as inputs electricity and the desalination plant feed stream. Substantial units of 6000 and 30,000 GPD have operated at a total power level of 2.5 kwhr/I000 gal. There are indications that this could be cut in half. The large systems tested suffer from two correctable defects. First, the cells in future units should be long thin rectangles or lozenges to get better flow distribution and to avoid problems associated with buffer precipitate settling in the quiescent portions of the round cell sections used here. And, second, further work on the catholyte/buffer system is required. Flow rates, stream ratios, and the like must be readjusted to produce a high salinity buffer stream before any significant cell power reduction is possible. Further, if the pH of the buffer can be lowered by only 1 unit, additional improvements in power requirements can be realized.
Experimentally‐measured pressure‐drop data are compared with analytical predictions for laminar flow of non‐Newtonian fluids in circular conduits, under constant wall heat flux boundary condition. The non‐Newtonian pseudoplastic solutions used in this study were aqueous solutions of Methocel® (0.75% – 2% w/w) and Carbopol 934® (0.15% – 0.50%). The heated section was 0.792″ i.d. × 1″ o.d. × 112.87″ long brass tube with an additional length of 68″ acting as the entrance length. The analytical predicitions on pressure drop have been based on numerically computed or analytically‐postulated temperature profiles. The mean deviation of the predicted values from the experimental values is of the order of ±8%.
freehand sketch). Many footnotes have been deleted because they refer to classified material, and the frequent gaps at the bottoms of pages are a mute memorial to the many workers whose contributions to the theory will remain generally unknown. The long delay in the final publication of the book inevitably detracts a little from its worth. For example, the list of rockets for which design details are given has an air almost of antiquity, and it is noticeable that very few of the references are later than 1947. Also it is obvious that the book was virtually complete before the publication in 1949 of Rankin's "Theory of the Motion of Rotated and Unrotated Rockets", which indeed does not appear among the footnotes until p. 433, though it covers much of the same ground. Those who are familiar with Rankin's monograph will find that the book under review does not go so deeply into the fundamentals, and mathematically it is less rigorous ; but there is a much fuller explanation of the physical processes and more linking narrative. Indeed, the authors are to be congratulated on producing a book which, as well as being authoritative, is, considering the difficulty of the subject, easy to read.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.