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oai:keep.lib.asu.edu:node-2003452025-06-09T23:16:56Zoai_pmh:alloai_pmh:repo_items

200345 https://hdl.handle.net/2286/R.2.N.200345 http://rightsstatements.org/vocab/InC/1.0/ http://creativecommons.org/licenses/by-nc-sa/4.0 2025-05 65 pages Parkerson, Emily Rykaczewski, Konrad Pathikonda, Gokul Barrett, The Honors College Mechanical and Aerospace Engineering Program This project aims to develop an affordable and accurate method for measuring the convective heat transfer coefficient of the human body in turbulent outdoor conditions. Quantifying convective heat exposure of the human body in extreme heat using a cost-effective device is a critical step toward the development of a scalable, personal bio-meteorological station for routine use and wide deployment. Two designs were fabricated and tested to evaluate convective heat transfer. The first design utilized a setup comprised of three cylinders, each with a different diameter governed by its own energy balance equation. This allowed for independent calculation of the convective heat transfer coefficient for each cylinder from which mean wind speed, turbulence intensity, and turbulence length scale can be found. The second design utilized a single larger cylinder with a diameter of 17.3 centimeters in order to simulate a human body. This cylinder was expected to produce a convective heat transfer coefficient close to that of the human body in extreme heat conditions. These cylinders were tested in both indoor and outdoor environments. Indoor testing was conducted in a wind enclosure located in a temperature-controlled room. Outdoor experiments took place in the courtyard of the Walton Center for Planetary Health on Arizona State University’s Tempe Campus. Overall, the results were promising. Data from the 17.3 centimeter diameter, 10 centimeter height cylinder closely aligned with that from the human body when tested in the wind enclosure. Further refinement of the outdoor experimental setup is needed for more accuracy in those conditions. The tri-cylinder setup resulted in convective heat transfer coefficients slightly higher than expected, possibly due to the non-isothermal behavior of the cylinders. To address this, the three cylinders should be re-fabricated with increased wall thickness to better meet isothermal assumptions. Heat Transfer Human health Turbulent Flows Convection Radiation Personal Bio-Meteorological Stations: Measuring Heat Transfer of the Human Body in Turbulent Outdoor Flows