Table 1 Specifications of experimental uncertainties.

From: Evaluation of heat transfer performance of a heat exchanger tube mounted with an I-rib twisted tape and twisted winglets

Variables

(%) Uncertainties device/Method used

Kinematic viscosity, µ

± 2.11 Curve-fitting formula

Differential pressure, ΔP

± 1.3 Dwyer MS2

Air velocity, U

± 2.41 Hot-wire Anemometer

Thermal conductivity, k

± 3.1 Curve-fitting formula

Air temperature, T

± 0.1 RTD Pt100

Density, ρ

± 2.17 Curve-fitting formula

Power input

± 0.5% Digital Power Meter

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