Flush-Mounted Steady-Periodic Heated Film With Application to Fluid-Flow Measurement

2006 ◽  
Author(s):  
Kevin D. Cole
Keyword(s):  
Fluid Flow ◽  
Flow Measurement ◽  
Solid Wall ◽  
Temperature Response ◽  
Integral Expression ◽  
Periodic Heating ◽  
Flow Speeds ◽  
Axial Heat ◽  
Unsteady Heating ◽  
Fluid Flow Measurement

Recently unsteady heating of surface-mounted films has been applied to the measurement of fluid flow. In this paper steady-periodic heating of a surface-mounted film is studied analytically. Wall effects and axial heat conduction in the fluid are included. The temperature is found as an exact integral expression constructed from separate Green's functions formulations in the fluid flow and in the solid wall that are matched at the fluid-solid interface. Numerical results for temperature, obtained by quadrature, are reported for several flow speeds and several steady-periodic frequencies. The results show that steady-periodic heating has potential for fluid-flow measurement because the system may be tuned, via frequency, to maximize the temperature response at the fluid flow of interest. Simulated calibration curves are given.

scholarly journals Flush-Mounted Steady-Periodic Heated Film With Application to Shear-Stress Measurement

2008 ◽  
Vol 130 (11) ◽  
Author(s):  
Kevin D. Cole
Keyword(s):  
Shear Stress ◽  
Fluid Flow ◽  
Stress Measurement ◽  
Solid Wall ◽  
Temperature Response ◽  
Surface Films ◽  
Periodic Heating ◽  
Flow Speeds ◽  
Axial Heat ◽  
Unsteady Heating

Surface-mounted heated films have been used for fluid-flow measurement for many years. Recently unsteady heating of such surface films has been explored experimentally. In this paper steady-periodic heating of a surface-mounted film is studied analytically. Wall effects and axial heat conduction in the fluid are included. The temperature is found as an exact integral expression constructed from separate Green’s function formulations in the fluid flow and in the solid wall that are matched at the fluid-solid interface. Results for temperature, obtained by quadrature, are reported for several flow speeds and several steady-periodic frequencies. The results show that steady-periodic heating has potential for shear-stress measurement because the heating frequency may be tuned to maximize the temperature response at the shear stress of interest. Thermal calibration of these sensors is discussed, and simulated calibration curves are given.

scholarly journals Fluid flow measurement in rotor ventilation ducts

2019 ◽  
Vol 2019 (17) ◽  
pp. 4486-4489
Author(s):  
Christopher Micallef ◽  
Joseph Degabriele ◽  
Darren Camilleri
Keyword(s):  
Fluid Flow ◽  
Flow Measurement ◽  
Ventilation Ducts ◽  
Fluid Flow Measurement

Time-of-flight application for fluid flow measurement

2009 ◽  
Author(s):  
Brian Markey ◽  
Yizhong Yu ◽  
Tamas Ban ◽  
Gagan Johal
Keyword(s):  
Fluid Flow ◽  
Flow Measurement ◽  
Time Of Flight ◽  
Fluid Flow Measurement

A Metrological Traceability System for Microflowrate Measurement

2005 ◽  
Author(s):  
C.-T. Yang ◽  
W.-T. Lin ◽  
F.-R. Yang ◽  
C.-C. Feng
Keyword(s):  
Fluid Flow ◽  
Flow Measurement ◽  
Metrological Traceability ◽  
Measurement Standard ◽  
Traceability System ◽  
Liquid Handling ◽  
Micro Fluidics ◽  
Fluidic Devices ◽  
Design And Manufacture ◽  
Fluid Flow Measurement

Applications of MEMS have prompted the design and manufacture of fluidic devices for sub-microliter fluid flow measurement. The accuracy of flowrate in terms of traceability and repeatability provides key information for successful micro-fluidics applications. To establish a measurement standard for microflow sensors and microflow controller for liquid handling and microfluidic monitoring, a traceable measurement system at Taiwan’s NMI has been sponsoring since 2002. The applied approaches included a gravimetric approach, a virtual piston approach, and a velocity-based approach. The expected flowrate ranges from 10 mL/min down to 10 nL/min, and the measurement uncertainty is evaluated. In this paper, the gravimetric approach and the chip based volumetric approach were demonstrated of their measurement setup and capability.

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