Oscillatory Behaviour in Statically Stressed Viscoelastic Inflation Flow

A mechanism for oscillatory instability in viscoelastic cross - slot flow

Interior stagnation point flows of viscoelastic liquids arise in a wide variety of applications including extensional viscometry, polymer processing and microfluidics. Experimentally, these flows have long been known to exhibit instabilities, but the mechanisms underlying them have not previously been elucidated. We computationally demonstrate the existence of a supercritical oscillatory instab...

Viscoelastic Effects on the Entropy Production in Oscillatory Flow between Parallel Plates with Convective Cooling

The heat transfer problem of a zero-mean oscillatory flow of a Maxwell fluid between infinite parallel plates with boundary conditions of the third kind is considered. With these conditions, the amount of heat entering or leaving the system depends on the external temperature as well as on the convective heat transfer coefficient. The local and global timeaveraged entropy production are compute...

Behaviour of an Oscillatory

The boundedness on weighted local Hardy spaces h 1;p w of the oscil-latory singular integral Tf(x) = Z R n e iQ(x;y) K(x; y)f(y)dy is considered when Q(x; y) = P(x ? y) for some real-valued polynomial P with its degree not less than two. Also a suucient and necessary condition on polynomial Q on R n R n such that T maps h 1;p w to weighted integrable function spaces L 1 w is found. AMS subject ...

Scaling behaviour in warm inflation

Viscoelastic behaviour of pumpkin balloons

The lobes of the NASA ULDB pumpkin-shaped super-pressure balloons are made of a thin polymeric film that shows considerable time-dependent behaviour. A nonlinear viscoelastic model based on experimental measurements has been recently established for this film. This paper presents a simulation of the viscoelastic behaviour of ULDB balloons with the finite element software ABAQUS. First, the stan...