Non-Newtonian Flow and Applied Rheology, Second Edition: by R. P. Chhabra, J.F. Richardson

By R. P. Chhabra, J.F. Richardson

This publication bridges the distance among the theoretical paintings of the rheologist, and the sensible wishes of these who've to layout and function the platforms within which those fabrics are dealt with or processed. it's a longtime and significant reference for senior point mechanical engineers, chemical and method engineers, in addition to any engineer or scientist who must research or paintings with those fluids, together with pharmaceutical engineers, mineral processing engineers, clinical researchers, water and civil engineers. This re-creation covers a significantly broader variety of subject matters than its predecessor, together with computational fluid dynamics modelling thoughts, liquid/solid flows and purposes to components reminiscent of foodstuff processing, between others.

  • Written by means of of the world's best specialists, this is often the one devoted non-Newtonian circulate reference in print.
  • Since first ebook major advances were made in just about all parts lined during this booklet, that are included within the new version, together with advancements in CFD and computational innovations, speed profiles in pipes, liquid/solid flows and purposes to nutrition processing, and new heat/mass move tools and models.
  • Covers either easy rheology and the fluid mechanics of NN fluids - a actually self-contained reference for someone learning or operating with the processing and dealing with of fluids

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Additional info for Non-Newtonian Flow and Applied Rheology, Second Edition: Engineering Applications (Butterworth-Heinemann/IChemE)

Sample text

As the number density of coils increases (by concentration in solution or by molecular weight in melts), inter-chain interactions in the form of entanglement and intertwining increase. When subject to an external force, these ‘structures’ continuously slide over each other during which it can knot up and disengage from individual entanglements. The visco-elasticity in polymeric melts and concentrated polymer solutions originates from the tension in the chains between disentanglement while the entangled chains slide over each other.

It is not at all difficult to perturb their configuration by the application of relatively small forces. 31), disentangling of loose networks, uncoiling and stretching, etc. in the presence of an imposed flow or force. In spite of their relatively large size, Brownian effects tend to randomize the flow units present in such polymeric systems. As seen above, the rheological behaviour of two-phase systems with fluid or solid particles is influenced strongly by pair interactions, the polymeric systems also exhibit a rich spectrum of interesting and complex characteristics once the polymer molecules begin to interact, entangle, knot up with each other.

The effect of branching, (especially long-chain) is also modulated by shear rate. 36), long-chain branching impedes relaxation thereby adding to the viscosity of a polymer at low shear rates. Also, once a branched polymer has been processed for some time, it attains some chain configurations which require a very long time to randomize thereby introducing a dependence on the shear history. On the other hand at high shear rates, the viscosity of a branched system can be lower than that of a linear system of the same molecular weight.

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