DEVELOPMENT OF ULTRA-MINIATURE WALL-SHEAR-STRESS SENSORS FOR LOW- AND HIGH-SPEED FLOW APPLICATIONS
Abstract
Unsteady and turbulent shear flows present several challenging scientific problems that demand well-resolved experimental data for effective modeling and good engineering design. In such flows, wall-shear-stress (or skin friction) is a physical quantity of fundamental importance. At present there exist no well-established techniques for time-resolved measurements of wall-shear- stress in high-speed flows, and existing measurement capabilities in the low-speed flow regime are limited in terms of both spatial and temporal resolution. To address this need, the proposed project is designed to develop and extensively test an ultra-miniature wall-shear-stress sensor based on the principles of thermal anemometry. The sensors will be built using nano-fabrication techniques, and will be applied in studies of low- and high-speed boundary layer flows. The sensors are expected to deliver a frequency response that is 100 kHz or higher with a spatial resolution of 0.1 μ! m2, making them a novel proposition with reference to the present state-of-the-art. The primary outcome from the project would be highly-resolved boundary layer flow experimental data which will lead to new insights into flow physics, and directly aid in flow modeling and computational efforts. Further, the proposed activity will lay the groundwork for future development of ultra-miniature sensors with integrated multi-property sensing capabilities, and also potentially lead to the development of ultra-miniature sensors for flight applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2023
- Source ID
- FA23862114107
Entities
People
- Subrahmanyam Duvvuri
Organizations
- Air Force Office of Scientific Research
- United States Air Force