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Examples
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The volumetric flow rate variation created error in the superficial velocity calculation, which also propagated to Re and then to Dittus-Boelter.
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For the Dittus-Boelter equation to be valid Reynolds number of water has to be greater than or equal to 10,000.
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To obtain the internal convection coefficient, hi, for fully developed single-phase turbulent flow in a tubular pipe, an empirical estimation called the Dittus-Boelter equation was used: k hi = 0.0265 Re 0.8 Pr 0.3 D (2) ii Which is valid for: 0.7 ≤ Pr ≤ 16,700 Re ≥ 10,000 D 3 L ≥ 10 D
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When the temperature variation created error in the physical properties calculations, it propagated first to the dimensionless parameters Pr and Re, and then to the Dittus-Boelter equation.
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