Hot Surface Ignition of n-Hexane Mixtures Using Simplified Kinetics

Hot surface ignition is relevant in the context of industrial safety. In the present work, two-dimensional simulations using simplified kinetics of the buoyancy-driven flow and ignition of a slightly lean n-hexane–air mixture by a rapidly heated surface (glowplug) are reported. Experimentally, ignition is most often observed to occur at the top of the glowplug; numerical results reproduce this trend and shed light on this behavior. The numerical predictions of the flow field and hot surface temperature at ignition are in quantitative agreement with experiments. The simulations suggest that flow separation plays a crucial role in creating zones where convective losses are minimized and heat diffusion is maximized, resulting in the critical conditions for ignition to take place

Relationship between subscapularis tears and injuries to the biceps pulley

The purpose of this study was to analyse the relationship between long head of the biceps brachii (LHBT) lesions and subscapularis tears. The hypothesis was that a bicipital pulley might remain intact, even in the case of a subscapularis tear

Turbulent Windprint near the Wave Onset and its Link with O. M. Phillips 1957 Theory

International audienc

Effect of a weak current on wind-generated waves in the wrinkle regime

International audienc

Occupational outcome after surgery in patients with a rotator cuff tear due to a work-related injury or occupational disease. A series of 262 cases

SummaryThe goals of this study were to establish the occupational outcome after surgery in patients with a rotator cuff tear from a work-related injury (WRI) or occupational disease (OD) and determine which factors and conditions affected return to work. Hypothesis: return to work was possible for this type of patient. This questionnaire-based study comprised 262 shoulders in 254 patients with a WRI/OD who had surgery performed on their shoulder between 2000 and 2005. The average age was 50.5±6.4years. The following variables were analysed: employment status (private sector, self-employed, government employee), type of work (non-manual, manual, heavy manual labour), nature of tendon injury and surgical technique (open, mini-open and arthroscopy). Return to work occurred in 59.5% of the cases. Factors that prevented return to work (40.4% of the cases) included retirement (14.1%), an unrelated medical condition (10.3%), and the outcome of the operated shoulder (16.0%). Age had an impact on return to work (P<5×10−4). The type of work and nature of tendon injury did not affect return to work, but did affect time away from work. Employment status and surgical technique had an effect on return to work, but not on time away from work. Age was a decisive factor for return to work. Retirement seemed to be the most common choice starting at 55 years of age. Arthroscopy seemed to have reduced the impact of the WRI on the results, particularly on the time away from work. A preoperative evaluation of the patient's probability of returning to work should be done based on occupational and injury features. There may be a longer delay in returning to work for certain profiles of work (manual labour) and tendon injury. Patient management can be improved by knowing the factors and conditions that influence return to work.Level of evidenceLevel IV - Retrospective study