Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
HOT-WIRE ANEMOMETERS: DESIGN AND ENGINEERING APPLICATIONS
Submission Author:
Murilo Franco Coradini , PR
Co-Authors:
Murilo Franco Coradini, Robson Leal da Silva
Presenter: Murilo Franco Coradini
doi://10.26678/ABCM.ENCIT2018.CIT18-0240
Abstract
Fluid velocity measurement systems with low-cost are desired in industry and scientific research applications. Thermal anemometry is an appealing option, once its able to measure low speeds conditions and its fluctuations, for velocities (as in turbulent flow) or temperature (as in magnetic field interference). In this work, design HWA prototypes are built with Constantan and Tungsten filament materials, providing measurements when operating in very low speeds (< 2 m.s-1). In-house fabrication intends to have a low-cost device in comparison to commercial HWA, and data acquisition through Arduino. Main conclusions are: a) Electrical voltage is practically constant in the test range conditions, approaching an HWA-CVA behavior; b) The temperature achieved in higher airspeed (Constantan, 1.5 and 1.7 m.s-1) approach to HWA-CCA behavior with constant ΔT; c) Tungsten filament presents better behavior than Constantan, in low speeds (< 1.0 m.s-1); d) Constantan achieves higher temperature variation, thus better indicated for CTA design; e) Tungsten wire achieves constant temperatures for lower speeds, thus better indicated for CCA design.
Keywords
calibration, Turbulence, data acquisition system, airspeed measurements, experimental engineering
