低流量恒湿气流的发生

Generation of constant humidity with low airflow

在常温下，用恒定气压与长毛细管向干燥的空气流中供给极小流量的恒流纯净水，水进入空气流立即蒸发。根据输水量与空气流量可计算出空气中水蒸汽的绝对湿度，由当时的温度计算出相对湿度。在空气流量为０．１９～０．４ｍ３／ｈ，相对湿度在３０％～９０％范围内，计算值与测量值相对偏差为±１０．１％

method of generating a constant humidity with low airflow under general temperature was developed. Deionized water was passed through a long capillary tube under stable pressure. The minor flow of water mixing with dry, hot and constant airflow is evaporated immediately. The absolute humidity of airflow can be calculated from the amount of flowing air and water. The relative humidity can also be calculated by the absolute humidity and the saturated steam concentration at the chamber temperature. The relative bias between the calculated value and the measured value is ±10% while the airflow is 0.19～0.4m 3/h and relative humidity is 30%～90%.