Flow boiling of water across a bank of circular staggered micro-pin fins, 250 lm long and 100 lm diameter with pitch-to-diameter ratio of 1.5, was experimentally studied for mass fluxes ranging from 346 kg/m s to 794 kg/m s and surface heat fluxes ranging from 20 W/cm to 350 W/cm. Local temperature measurements were used to elucidate the two-phase heat transfer coefficients. The flow was visual...

Defects such as porosity and cracking are serious problems in the joining of aluminium its alloys by melt welding methods. In this case, it is important that aluminum pairs welded friction stir (FSW), which depend on at a temperature below melting means stirrer pin. study, AA5182 were joined different parameters FSW. The effects tool pin profily, feed rate rotation speed temperature, force vibr...

We give necessary and sufficient conditions for the existence of pin ± and spin structures on Riemannian manifolds with holonomy group Z k 2. For any n ≥ 4 (resp. n ≥ 6) we give examples of pairs of compact manifolds (resp. compact orientable manifolds) M1, M2, non homeomorphic to each other, that are Laplace isospectral on functions and on p-forms for any p and such that M1 admits a pin ± (res...

sometimes the need for non-circular ducts arises in many heat transfer applications because of lower pressure drop of non-circular cross section such as square duct compared to circular tube, particularly in compact heat. but square cross section has poor heat transfer performance and it is expected that using a nanofluid as a new heat transfer media may improve the heat transfer performance of...

background: the treatment of open tibial fractures is still an orthopaedic challenge and full of complications. in many cases the use of external fixator that has been known as a non-:union: machine is obligatory with a high incidence of pin track infection and other complications. the aim of this study was to compare the use of external fixation as a definite method for treatment of open tibia...

PURPOSE To report the outcomes of modified Rush pin fixation for proximal humeral fractures. METHODS 42 men and 20 women aged 19 to 94 (mean, 64) years with 2- or 3-part proximal humeral fractures underwent reduction and fixation using the modified Rush pin technique. 11 patients died from reasons unrelated to the surgery. RESULTS Of 40 (out of 51) patients completing a subjective functiona...

BACKGROUND Developed for the treatment of deformity correction, computer-assisted circular external fixators in recent years have also been used for fracture fixation. In this study, we aimed to present the efficacy of computer-assisted circular external fixator use in open long bone fractures with our new technique. METHODS Between February 2013 and June 2014, 14 patients (mean age 24.5 (ran...

Bending analysis of multilayer graphene sheets (MLGSs) subjected to non-uniform shear and normal tractions is presented. The constitutive relations are considered to be non-classical based on nonlocal theory of elasticity. Based on the differential transformation method, numerical illustrations are carried out for circular and annular geometries. The effects of nano scale parameter, radius of c...

This work presents a new highly automated artificial vision inspection (AVI) tool for real-time defect detection and classification on circular knitting machines based on the combination of statistical analysis, Image Processing and Radon Transform. The tool (software + hardware) is directly attached to a circular knitting machine and the inspection is performed on-line. The automatic inspectio...