Honey bees (Apis mellifera) are remarkable fliers that regularly carry heavy loads of nectar and pollen, supported by a flight system - the wings, thorax and flight muscles - that one might assume is optimized for aerial locomotion. However, honey bees also use this system to perform other crucial tasks that are unrelated to flight. When ventilating the nest, bees grip the surface of the comb o...

Abstract Impeller discharge flow plays an important role in centrifugal compressor performance and operability for two reasons. First, it determines the work factor relative diffusion impeller. Second, sets into downstream stationary system. The choice made preliminary design phase impeller exit velocity triangle is crucial a successful design. state-of-the-art approach determining relies on se...

Cavitation is regarded as a considerable factor causing performance deterioration of pumps under off-design conditions, especially at overload conditions. To investigate the unsteady cavitation evolution around tongue pump volute, and its influence on flow field within passages impeller, numerical calculations several hydraulic tests were performed typical centrifugal with shrouded impeller. Em...

By means of setting inlet pre-rotator ,the inlet and exit flow field of the diagonal flow impeller with exit guide volute have been measured with 5 holes probe, in different flow conditions, and in the conditions of positive and negative pre-rotating. The expe1iment results are compared with that of without the pre-rotator.

Abstract The mechanical characteristics of the impeller are important indicators that determine working pump. pump is subjected to periodic hydraulic loads during process. This load will cause dynamic deformation and shaft, thereby further affecting distribution fluid. Liquid-solid coupling used. Method, rated operating point centrifugal analyzed, it proved stress shaft meets requirements, whic...

BACKGROUND Mass transfer plays an important role in determining the efficiency of the biofuel conversion. However, adverse effect of shear stress from traditional agitation inhibits the cell growth and production of biofuels. How to enhance the mass transfer with less adverse effect is considered as one of the important bioengineering issues. RESULTS In this study, a novel agitation type, nam...

In order to improve the hydraulic performance of a deep-sea mining pump, this research proposed multi-objective optimization strategy based on computational fluid dynamics (CFD) numerical simulation, genetic algorithm back propagation (GABP) neural network, and non-dominated sorting algorithm-III (NSGA-III). Significance analysis impeller diffuser parameters was conducted using Plackett–Burman ...