Cross-correlation velocimetry for measurement of velocity and temperature profiles in low-speed, turbulent, nonisothermal flows

Journal Article · Fri May 01 00:00:00 EDT 1992 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2911280· OSTI ID:7265283

Motevalli, V ^[1]; Marks, C H ^[2]; McCaffrey, B J ^[3]

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1. Worcester Polytechnic Inst., MA (United States)
2. Univ. of Maryland, College Park (United States)
3. Univ. of Maryland, Baltimore (United States)

A technique utilizing thermocouple pairs as sensors to measure velocity and temperature profiles in low-speed, turbulent, nonisothermal flows is described here. In this technique, Cross-Correlation Velocimetry (CCV), the temperature-time records from a pair of thermocouples, one downstream of the other, are cross-correlated to determine the flow's preferred mean velocity while temperature is measured directly. The velocity measurements have undergone extensive verification using hotwire, pitot tube, and Laser-Doppler Velocimetry to determine the degree of confidence in this technique. This work demonstrates that the CCV technique is quite reliable and can measure the mean preferred component of the convective velocity with better than {plus minus}5 percent certainty. Application of this technique to the measurement of velocities in a ceiling jet induced by a fire plume is briefly presented here.

• OSTI ID: 7265283
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 114:2; ISSN 0022-1481
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
TURBULENT FLOW
TEMPERATURE GRADIENTS
VELOCITY
FIRES
IMPINGEMENT
JETS
MEASURING METHODS
THERMOCOUPLES
VELOCIMETERS
FLUID FLOW
MEASURING INSTRUMENTS
420400* - Engineering- Heat Transfer & Fluid Flow