The overall cooling performance of turbine nozzle guide vane, with the impingement-cutback structure, is experimentally studied in actual-scale cascade. gas high temperature used to achieve actual dynamic viscosity coefficient and density ratios. coolant-to-gas mass flow ratio (KG) varies between 0.034 0.050 gas-to-coolant (KT) 1.5 2.4. local Overall Cooling Effectiveness (OCE) on middle cross-...

BACKGROUND We aimed to search whether alpha angle, a radiological clue used in the diagnosis of femoroacetabular impingement, is correlated with the presence of hip pain, internal rotation angle, and impingement test results on hip impingement patients (CAM type). METHODS Medical records of 334 patients (156 women, 178 men) with an average age of 33.8 ± 8.4 (range 20-50) years were retrospect...

A mechanistic link has been suggested between cam-type femoroacetabular impingement and increased stress on the symphysis pubis. This retrospective study was conducted to determine whether there is an increased prevalence of osteitis pubis, as evidenced by imaging, in patients with femoroacetabular impingement compared with age-matched control subjects. Search of a radiologic database of a larg...

The range of motion of normal hips and hips with femoroacetabular impingement relative to some specific anatomic reference landmarks is unknown. We therefore described: (1) the range of motion pattern relative to landmarks; (2) the location of the impingement zones in normal and impinging hips; and (3) the influence of surgical débridement on the range of motion. We used a previously developed ...

he principles regarding impingement in the natural osseous (anatomic) hip put forth by Ganz et al. are similar in concept to what can occur in the prosthetic hip. To understand impingement, it is helpful to recognize the common mechanisms that cause mechanical abutment in both anatomic and prosthetic hips. In the anatomic hip joint, impingement is a mechanical abutment conflict between the bone...

The rising demand for efficient cooling technologies is a strong driver of extensive research in this area. This trend particularly turbines and microprocessors technology. Presented study focused on the jet impingement concept, which used various configurations many years. potential heat sink shape modification not yet fully explored. Available literature suggests that average Nusselt number c...

The aim of this work is to present a methodology to develop cost-effective thermal management solutions for microelectronic devices, capable of removing maximum amount of heat and delivering maximally uniform surface temperature distributions. The topological and geometrical characteristics of multiple-story threedimensional branching networks of microchannels were developed using multi-objecti...

As a promising and efficient active cooling method, double layer transpiration is introduced into the design of system in leading edge hypersonic vehicle. The physical model built combined with cooling, film heat conduction, porous media conduction convection transfer. In addition, effects different kinds coolants are considered to reveal mechanisms operation conditions. A comprehensive turbule...