In this work, the steady and laminar mixed convection of nanofluid in horizontal concentric annulus withrotating inner cylinder is investigated numerically. The inner and outer cylinders are kept at constanttemperature Ti and To respectively, where Ti>To. The annular space is filled with Alumina-water nanofluid.The governing equations with the corresponded boundary conditions in the polar coord...

The paper presents a design and operation analysis of an Integrated Collector Storage (ICS) solar water heater, which consists asymmetric Compound Parabolic Concentrating (CPC) reflector trough, while the tank comprises two concentric cylinders. annulus between these vessels is partially depressurized contains small amount in bottom outer vessel dominantly contributes to heat transfer from inne...

Abstract Deep fractured formations have poor pressure-bearing capacity and a narrow safety drilling fluids density window, leading to high risk of well control. Accurate prediction annulus pressure drop is great significance the safe deep formations. Conventional predictions are mostly based on regular circular but elliptical easily formed due rock structure, mechanical properties heterogeneity...

The dispersion in an eccentric annulus region by taking blood as a Newtonian fluid with the investigation of oxygen transfer to the tissue cells in an eccentric catheterized artery is studied. The region bounded by eccentric circles in x-y plane is conformal mapping to concentric circles in   plane using a conformal mapping 1 . z c    The resulting governing equations are analytically solv...

We present a study on the behavior of air bubbles captured in a Taylor vortex formed in the annulus between two concentric cylinders. It is found that small bubbles stay either at certain locations near the vortex cores or in the outflow regions along the inner cylinder. If bubbles of the same size are introduced, a variety of bubble structures (such as ring, chain, cluster, etc.) appear due to...

We investigate whether a search light, S, illuminating a tiny angle (“cone”) with vertex A inside a bounded region Q ∈ IR with the mirror boundary ∂Q, will eventually illuminate the entire region Q. It is assumed that light rays hitting the corners of Q terminate. We prove that: (I) if Q = a circle or an ellipse, then either the entire Q or an annulus between two concentric circles/confocal ell...