TY - JOUR
T1 - Development of a critical airflow venturi for air sampling
AU - Wang, Xinlei
AU - Zhang, Yuanhui
PY - 1999/1/1
Y1 - 1999/1/1
N2 - Air sampling is a key element in environmental studies and occupational exposure assessments. Airflow control and measurement is critical to the accuracy of air sampling. Commercially available flow controlling orifices were found to lack the required precision and accuracy. Most critical orifice designs require a pressure drop in excess of 47 kPa to ensure a stable flow. To achieve this pressure drop, a special high-power vacuum pump must gbe used. There is no existing design standard available for small critical orifices or venturi (throat diameter smaller than 12.5 mm). Many efforts have been made to experimentally develop a critical airflow control device with low pressure drop, but the procedure and the products are both labour-intensive and inaccurate. Based on the theory of fluid mechanics and experimental optimization, a series of unique critical airflow venturi have been developed to provide a constant air flow rate at low pressure drops (approximately 9 kPa), with variations of less than 1% of the full scale flow rate. These venturi can be widely used in air quality studies and other field for accurate gas flow rate control.
AB - Air sampling is a key element in environmental studies and occupational exposure assessments. Airflow control and measurement is critical to the accuracy of air sampling. Commercially available flow controlling orifices were found to lack the required precision and accuracy. Most critical orifice designs require a pressure drop in excess of 47 kPa to ensure a stable flow. To achieve this pressure drop, a special high-power vacuum pump must gbe used. There is no existing design standard available for small critical orifices or venturi (throat diameter smaller than 12.5 mm). Many efforts have been made to experimentally develop a critical airflow control device with low pressure drop, but the procedure and the products are both labour-intensive and inaccurate. Based on the theory of fluid mechanics and experimental optimization, a series of unique critical airflow venturi have been developed to provide a constant air flow rate at low pressure drops (approximately 9 kPa), with variations of less than 1% of the full scale flow rate. These venturi can be widely used in air quality studies and other field for accurate gas flow rate control.
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U2 - 10.1006/jaer.1999.0414
DO - 10.1006/jaer.1999.0414
M3 - Article
AN - SCOPUS:0004032735
VL - 73
SP - 257
EP - 264
JO - Biosystems Engineering
JF - Biosystems Engineering
SN - 1537-5110
IS - 3
ER -