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Internal Flow in a Chimney Flue

Internal Flow in a Chimney Flue. Brad Borchert. Objectives. Scale a standard chimney Determine the flue inlet, exit, and outer surface temperatures using a thermocouple Compare the experimental value of the exit temperature with the theoretical values of: Dittus Sieder Petukhov

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Internal Flow in a Chimney Flue

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  1. Internal Flow in a Chimney Flue Brad Borchert

  2. Objectives • Scale a standard chimney • Determine the flue inlet, exit, and outer surface temperatures using a thermocouple • Compare the experimental value of the exit temperature with the theoretical values of: • Dittus • Sieder • Petukhov • Gnielinsky

  3. Experimental Flue Data Scaled Chimney

  4. Theoretical Exit Temperatures • Dittus • 423.51 K • Sieder • 423.44 K • Petukhov • 423.46 K • Gneilinsky • 423.40 K • Std. Deviation • .048 Backpacking Stove

  5. Results • Correlations predicted similar temps • Correlation error: • Dittus • 4.20% • Sieder • 4.18% • Petukhov • 4.19% • Gneilinsky • 4.17%

  6. Conclusions and Recommendations • The best correlation is Gneilinsky (Barely) • Correlations are similarly inaccurate • Error is within the 10% prescribed • Where possible, use the simplest correlation – the gain in accuracy is negligible • Don’t rely on correlations - Experiment

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