rather t.han the general elise, so that. ill the chapter on inst.ability of two-phase fl ow 1i0 reference is made, for example, to the (a ward-winning) 1963 paper of Ost.mch and Koestel. For a long t.ime it has been 11 fact that our unders(.a nding of the physics involved in vapor formation a nd tra nsport is insufficien t even \.0 p el'mit satisfactory determination of empirical relationhips ba.•ed, say, on dim ensional analysis. The recent advances in the cloud physics of bubbles in boi ling have not been suf"ficient to cha nge t.his fact. lH ean\\'hile, advances in technologicnl re-({llirements (the cooling of nuclea.r reactors and l'Ocket motors) have inc;reased t.hc need fur careful review and further investigation. This book should be vcry u~eful to designers a nd to investigators who w:Jnt a compact. survey of t.he subjeet a nd an extensive inll'OdllCl ion to i t~ lit enltlll'e. Elasticity Stability and Oscillations of Ela stic Systems. By Y. l'nnoyko a nd r. 1. Gu lx\I1oYi\. Translated by Ch a rles V. Larrick. COllsltl tants Bureau Entcrprises, Inc., New York, N. Y., 1!l65. C lot h , x and 20 1 pp. 817.50.
An elastic‐fluid theory of die‐swell for long dies is presented. The theory predicts a swelling ratio De/d asymptotically proportional, for large values of swelling, to the cube root of the recoverable shear evaluated at the die wall. Here the recoverable shear is defined to be half the ratio (first normal stress difference/shear stress). Excellent agreement is shown between predicted De/d and measured De/d for experiments on melts and solutions for which adequate data are available.
Viscoelast ic J e t Stability This paper, one of a series (3, 4, 10) on the stability of liquid jets, is especially concerned with jets formed by extrusion of viscoelastic liquids from long capillaries into still air. An investigation of the role played by elasticity in altering the growth rate of infinitesimal disturbances has been conducted, and the experimental results can be rationalized through a simple viscoelastic stability analysis.The phenomenon studied is the breakup into droplets F. William Kroesser is at Tufts University, Medford, Massachusetts.
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