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Convection Experiment. Leader: Tom Salerno Partners: Greg Rothsching Stephen Johnson Jen DiRocco. What will you hear today?. Introduction Theory Equipment and Procedure Results and Discussion Conclusions Questions. Introduction. What is convection?

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Presentation Transcript
convection experiment

Convection Experiment

Leader: Tom Salerno

Partners:

Greg Rothsching

Stephen Johnson

Jen DiRocco

what will you hear today
What will you hear today?
  • Introduction
  • Theory
  • Equipment and Procedure
  • Results and Discussion
  • Conclusions
  • Questions
introduction
Introduction
  • What is convection?
    • Heat transfer from fluid flowing over solid surface
  • Why study convection?
    • Occurs in almost every process plant
    • Example: Heat Exchangers, Tray Dryers, etc.
theory newton s law of cooling
Theory – Newton’s Law of Cooling
  • Flat Plate:
  • Finned Plate (Resistances in Parallel):
theory forced convection
Theory – Forced Convection
  • Physical Situation:
  • Solving Boundary Layer Equations
    • Continuity Equation -
    • Momentum Balance -
    • Thermal Balance –
    • Rigorous analytical solution
theory forced convection1
Theory – Forced Convection
  • Forced Convection – analytically developed
    • Dimensionless Parameters
      • Reynolds:
      • Prandtl:
      • Nusselt:
    • Flat Plate:
theory natural convection
Theory - Natural Convection
  • Physical Situation:
    • New Momentum Equation:
      • Must now solve all three boundary layer equations simultaneously
theory natural convection1
Theory - Natural Convection
  • Experimental Correlation:
    • Churchill and Chu
    • Dimensionless Parameters
      • Grashoff:
      • Rayleigh:
    • Correlation:
equipment and procedure
Equipment and Procedure

Figure 9: Front view of convection duct.

Figure 10: Side view of convection duct.

results and discussions
Results and Discussions
  • Flat Plate: Laminar Flow
results and discussions1
Results and Discussions
  • Turbulent Mix
    • New Correlation -
results and discussions2
Results and Discussions
  • Flat Plate: Turbulent Mix
results and discussions3
Results and Discussions
  • Finned Plate: Laminar
results and discussions4
Results and Discussions
  • Turbulent Mix
    • New Correlation -
results and discussions5
Results and Discussions
  • Finned Plate: Turbulent Mix
results and discussions6
Results and Discussions
  • Effectiveness of Fin Addition
conclusions what we learned
Conclusions – What we learned
  • The convective heat transfer coefficient increases linearly with the square root of air velocity
  • Predictive Equations are useful for predicting trend in data, but not the absolute numbers
  • Natural Convection is the limit to forced convection, though it is difficult to predict
  • The addition of fins will increase the heat transfer rate substantially at low air velocities, but not as much at higher air velocities
conclusions significance
Conclusions – Significance?
  • Aid in design of heat exchangers
    • How to increase heat transfer coefficient
    • How to increase heat transfer rate
    • Realize presence of natural convection for cheap ways to cool electronic equipment
  • Confidence of Predictive Equations
    • Use for other experiments, such as tray dryer
    • Only if can perfectly match geometry, or can run a short scale experiment to obtain correction factor
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