Sampling efficiencies of personal particulate samplers, terminal progress report.
Authors
Willeke-K
Source
University of Cincinnati, Cincinnati Ohio, 1981 Nov; :1-3
Link
NIOSHTIC No.
00134962
Abstract
A newly designed inlet for a particulate air sampler was developed. The inlet was integrated into a modified optical single particle counter that recorded the aerosol concentration penetrating through the inlet. The efficiency of a 20 centimeter long thin walled sampling tube incorporating the inlet was evaluated in a wind tunnel. The device was tested at wind velocities of 250 to 1000 centimeters per second (cm/s) and inlet velocities of 125 to 1000cm/s, oriented at angles of 0 to 90 degrees to the air flow. Efficiency was significantly reduced when sampling was performed at an angle to the flow. When the sampling velocity in the inlet differed from the ambient wind velocity, sampling efficiency was significantly increased. For particles larger than 10 micrometers in diameter, sampling efficiency was affected by small angles. Orienting the inlet upwind at an angle of 15 degrees reduced efficiency, whereas downwind sampling at an angle of 15 degrees increased efficiency. For angles of 30 to 90 degrees, the sampling efficiency was a function of the Stokes number and the ratio of wind velocity to inlet velocity.
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.