Many factors such as outer diameter, hub ratio, blade numbers, shape and stagger angle affect the performance of small cooling fans. A small cooling fan was simulated using CFD software for three blade stagger angles (30.5°, 37.5°, 44.5°)and obtained the internal flow field and the static characteristics. Research indicated that the stagger angle has an obvious effect on the static characteristics of a fan. For flow rates below 0.0104 m³/s, total pressure is the greatest when the stagger angle is 37.5°; flow rates higher than 0.0104 m³/s, the total pressure is greatest when the stagger angle is 44.5° For the same flow rates, the velocity at inlet of pressure surface increases with increasing stagger angle, but the change of velocity on the suction surface is very small. For one model, vortices and the speed of revolution surfaces decrease with tip clearance increasing. But for other three models, increasing the stagger angle, the vortex intensity and speed of revolution surfaces at same height tip clearance increases, simultaneously, the position of vortex offset from the top of the rotor blade to the suction surface.
The ion-sensitive field-effect transistors (ISFETs) with hydrogenated amorphous silicon (a-Si:H) were fabricated. In this paper, the hydrogenated amorphous silicon acting as sensing membrane was used to investigate the pH response of a-Si:H ISFET. The IDS-VG curves were carried out by I-V measuring system. The basic parameter of a-Si:H ISFET, namely sensitivity was obtained from IDS-VG curves. It exhibited a superior pH response of 50.6 mV/pH at temperature of 25CC.Moreover, other characteristic parameters such as hysteresis and drift were proposed. Finally, the effects of operating temperature on sensitivity and drift were presented.
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