Abstract
The drag force on fourteen three-prong spruce shoots ( Picea rubens) was measured over a range of wind tunnel velocities. The boundary layer resistance to momentum transfer was found to be influenced by the shoot orientation, inclination, and flexibility. Momentum transfer was also influenced by shoot needle density; however, this influence was a function of the shoot orientation. For wind velocities below about 2.0 m s −1, these factors did not greatly influence the momentum transfer to the shoots. For wind velocities above about 2.0 m s −1 the momentum transfer decreased with; (1) decreasing inclination of the shoot to the airflow, (2) decreasing shoot flexibility, and (3) orientating the shoot so that the densely-needled side of the shoot faced the wind. A pair of empirical equations were derived relating momentum transfer to wind velocity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
