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Heat transfer gradient through the reactor

Heat transfer gradient through the reactor. Yan & Vasudha. EGEE 520 project presentation. Dec 1 2005. 2. Introduction. Steel. Al 2 O 3. Air. 11. 9. 3. 5. 7. Glass reactor . 1. 12. Fuel. 10. 8. 6. 4. 2. 3. Governing equations. k: thermal conductivity (Wm -1 K -1 )

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Heat transfer gradient through the reactor

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  1. Heat transfer gradient through the reactor Yan & Vasudha EGEE 520 project presentation Dec 1 2005

  2. 2 Introduction Steel Al2O3 Air 11 9 3 5 7 Glass reactor 1 12 Fuel 10 8 6 4 2

  3. 3 Governing equations k: thermal conductivity (Wm-1K-1) A: cross-sectional area (m2) dT/dn: temperature gradient (Km-1) Conduction: Convection: h: heat transfer coefficient (Wm-2K-1) Tsolid: temperature at the surface of the solid body (K) Tfluid: ambient or remote temperature of the fluid (K) Radiation: εSB: Stefan-Boltzman constant (Wm-2K-4) σ: emissivity of the surface Tsolid: temperature at the boundary of the solid body (K) T∞: ambient temperature (K) Partial differential equation for heat conduction:

  4. 4 Formulation Initial assumptions: Steady-state process; Axial symmetry (2D); Modes: Convection and Conduction & Incompressible Navier-Stokers Subdomain and Boundary settings in FEMlab

  5. 5 Solution Temperature distribution with flow rate 0.01mL/s

  6. 6 Validation Heat gained by fluid when it passes through the reactor: q = 7.895 W/m3 Heat transfer through radial conduction in cylindrical wall: q = 9.7596 W/m3

  7. 7 Parametric Study Temperature distribution with flow rate 0.001mL/s

  8. 8 Parametric Study Temperature distribution with flow rate 0.1mL/s

  9. 9 Conclusion When the flow rate of fuel is high, temperature distribution is roughly symmetric with z = 0. The temperature of fuel is almost constant (293 K) except in two bottoms. When the flow rate of fuel is decreased, the temperature of fuel increases. Temperature distributions within Al2O3 and steel almost maintain the same no matter what the flow rate is. However, the temperature distribution within air changes with changing flow rate. FEMlab is a useful tool for simulation of heat transfer process, and the results of our modeling are reasonable.

  10. Questions?

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