Design of a natural dry cooling tower has been accomplished in two sections: the design of heat exchangers and the numerical solution of flow through the tower. Heat exchanger (Heller type) has been simulated thermodynamically and then coupled with a computer program, which calculated the turbulent natural convection flow through the tower. The computer program developed for this purpose can be...

A numerical simulation of a turbulent flow water in three shell and tube heat exchangers equipped with 6, 8, 10 segmental baffles as the working fluid at Reynolds numbers ranging from 24327, 33356, 42569 are performed. The conservation equations mass, momentum energy solved by finite volume method based on SIMPLE algorithm for coupling velocity-pressure, mathematical model k-ε within Fluent sof...

As a key component of the solid rocket motor, nozzle ablation is very important to performance motor. In order study influence law on motor performance, two-dimensional axisymmetric model ground state and vacuum before after was constructed basis reference profile, change pressure, temperature velocity with were studied. The comprehensive calculated evaluate performance. It found that profile c...

Computational fluid dynamics (CFD) is potentially a valuable tool for simulating the dispersion of air contaminants in workrooms. However, CFD-estimated airflow and contaminant concentration patterns have not always shown good agreement with experimental results. Thus, understanding the factors affecting the accuracy of such simulations is critical for their successful application in occupation...

A computational fluid dynamics (CFD) model of the air flow generated by an air-assisted sprayer equipped with two axial fans was developed and validated by practical experiments in the laboratory. The CFD model was developed by considering the total air flow supplied by the sprayer fan to be the main parameter, rather than the outlet air velocity. The model was developed for three air flows cor...

A series of fire tests in a 1/15 scaled-model tunnel with one closed end have been conducted. Analysis was carried out to explore temperature distribution and smoke propagation under the influence ceiling extraction system. Five different heat release rates, three dimensions exhaust outlet, numerous rates were considered. Experimental results led some interesting findings about relationships be...

Good public transportation that can offer a pleasant peaceful and relaxing environment is necessary for improving people's interest in using it. Thermal comfort determined this study by measuring the air velocity temperature of air-conditioning from outlet. Both data are taken digital anemometer thermocouple with three replications reproducibility. For collection, 10-row shuttle bus was held im...

This paper proposes an orthogonal experimental design based on the optimization method for nozzle geometry of underwater abrasive water jet, with objective maximizing cutting capacity and minimizing nozzle-erosion rate. Parameter effects nozzle’s capability life are analyzed. analysis shows that while contraction-section curve, axial length focus-section mainly affected service nozzle, nozzle-o...