DHHS, PHS, CDC, NIOSH, ALOSH, 1095 Willowdale Rd., Morgantown, WV 26505-2888

B -- SIMULATION OF GAS-PARTICLE FLOW FIELDS AROUND A THREE-INLET CYCLONE SAMPLER IN THE PRESENCE OF A HUMAN TORSO SOL RQ99-014 DUE 031699 POC Brenda Goodwin, 304/285-5882/Contracting Officer, Rex S. Wolfe, Jr. 304/285-5883 The National Institute for Occupational Safety and Health intends to negotiate a project entitled "Simulation of Gas-Particle Flow Fields Around a Three-Inlet Cyclone Sampler in the Presence of a Human Torso," on a sole source basis with the West Virginia University (WVU)-Office of Sponsored Programs. The respirable dust sampler currently used as a personal compliance sampler in U.S. coal mines suffers from sampling errors with respect to the respirable sampling conventions due to changes in wind velocity, sampling flow rate, and sampler orientation. These errors are referred to as inlet bias. Preliminary tests on an isolated cyclone sampler indicate that problems of orientation and velocity bias could be greatly minimized by using cyclone samplers. However, in reality, the sampler is worn by a worker on the lapel and the gas flow field at the sampler inlet is quite different from that experienced by a sampler in isolation. The purpose of this project is to obtain information on (1) gas and particle flow fields around a three-inlet cyclone sampler worn on a mannequin and (2) the aspiration and penetration efficiencies of the sampler using a computation fluid dynamics (CFD) model. The proposed Project Investigator at WVU has designed and tested a three-inlet cyclone for respirable dust sampling, which is licensed, but not commercially available for use on this project at this time. The proposed contractor has already generated a mannequin model in a simulated wind tunnel and has extensive experience with this device and other newly-designed cyclones to perform this project. Organizations that can demonstrate their capability to provide a sampling device comparable to the one described above shall submit information to Brenda Goodwin within seven (7) days of posting of this notice. This notice is issued for informational purposes only. Posted 03/08/99 (W-SN306110). (0067)

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