| 摘要 |
<p>PURPOSE:To improve measurement reliability and to reduce the dimensions of a main channel by providing a space part with a large channel area at the main channel and then providing the entrance of a bypass channel. CONSTITUTION:A space part 12 with a larger channel area than that of a main channel 13 is provided at the downstream of the main channel 13 and a main channel 14 is connected to the downstream of the space part 12. Liquid flowing in the direction of an arrow 6 enters the space part 12 and partially flows to a bypass channel 2. After flow velocity is measured by a thermal sensor 5 in the channel 2, a fluid flows from an exit 4 to the main channel 14 and then merges. The flow rate of the fluid flowing into the main channels 13 and 14 is obtained from the flow rate in the channel 2 which is measured by the sensor 5. Since the channel area of the space part 12 is larger than a main channel 13, the flow velocity decreases and at the same time pressure increases. Since the channel area is smaller than the space part 12 at the main channel 14, the flow velocity increases and at the same time pressure decreases. Therefore, the pressure in the space part 12 becomes higher than that of the main channel 14 and the flow in the channel 2 is constantly directed from the entrance 3 to the exit 4.</p> |
