The linear collisionless damping of zonal flows is calculated for quasi-symmetric stellarator equilibria in flux-tube, flux-surface, and full-volume geometry. Equilibria are studied from the quasi-helical symmetry configuration Helically Symmetric eXperiment (HSX), a broken HSX, quasi-axial geometry National Compact Stellarator (NCSX). Zonal flow oscillations long-time affect evolution, residua...

An experimental investigation for helical triple concentric tube heat exchanger has been carried out with different flow arrangements i.e. N-H-C (normal fluid inside hot at middle cold in outer annulus) and C-H-N (cold fluid in inner pipe hot in middle normal fluid in outer annulus) with parallel and counter flow types. The temperature distribution of fluids w.r.t. length of the heat exchanger ...

Structural transformations of superparamagnetic colloids confined within self-assembled microtubes are studied by systematically varying tube-colloid size ratios and external magnetic field directions. A magnetic field parallel to microtubes may stretch non-linear chains like zigzag chains into linear chains. Non-parallel fields induce new structures including repulsive chains of single colloid...

In addition to conventional planar and helical flagellar waves, insect sperm flagella have also been observed to display a double-wave structure characterized by the presence of two superimposed helical waves. In this paper, we present a hydrodynamic investigation of the locomotion of insect spermatozoa exhibiting the double-wave structure, idealized here as superhelical waves. Resolving the hy...

Block mutations were constructed in helical stems II, III, IV and V of Xenopus laevis oocyte 5S RNA. The affinities of these mutants for binding to transcription factor IIIA (TFIIIA) were determined using a nitrocellulose filter binding assay. Mutations in stems III and IV had little or no effect on the binding affinity of TFIIIA for 5S RNA. However, single mutants in stems II and V (positions ...

Helical coil has better heat transfer rate as compared to shell and tube exchanger, Because of development secondary flow. There are so many applications where the helical is used such heating ventilation air conditioning applications, steam generators in power plants, condenser’s, reason behind using it provides large surface area per unit volume. In presented work coefficient (hi) for inside ...

Plasma based therapeutic products must undergo viral inactivation steps in order to minimize the risk of infection. Non-enveloped viruses such as hepatitis A and parvovirus are more recently being inactivated by using Ultra Violet light C (UV-C) irradiation techniques. A commonly used form of UV-C irradiation involves passing the protein solution through a helical tube that wraps around an irra...