Abstract
This experimental study aims at measuring concentration of jet diffusion. Hot-wire concentration sensor to measure the concentration of the components in a binary mixture of gases is described. The concentration sensor consists of a concentration probe, a vacuum pump, a hot-wire amplifier. And the concentration probe consists of a brass sonic nozzle, a brass tube, a tungsten hot-wire to measure gas thermal conductivity of gas mixture. There are two main parameter in King's equation which are velocity and thermal conductivity. The sonic nozzle decreases the effect of velocity. The new probe calibrated with helium jet. The calibration curve was made with helium-air mixture. And the time constant was 0.9 ms. Contour of velocity and concentration of helium jet diffusion was measured.
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