Heat Flow in Cylindrical Sections
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Questions and Answers

What concept may be used for analyzing heat transfer in multiple-layer cylindrical walls?

  • Thermal Conductivity
  • Thermal Resistance (correct)
  • Specific Heat
  • Heat Flux
  • In a three-layer system of cylindrical walls, what is the solution provided?

  • Eqn. 2.9 (correct)
  • Eqn. 2.11
  • Eqn. 2.10
  • Eqn. 2.8
  • When analyzing spherical systems as one-dimensional, under what condition is the heat flow considered?

  • Temperature is a function of pressure only
  • Temperature is a function of radius only (correct)
  • Temperature is a function of time only
  • Temperature is a function of angle only
  • In the convection process, what term becomes the convection resistance in the electric-resistance analogy?

    <p>$1/hA$</p> Signup and view all the answers

    For a plane wall exposed to hot fluid A on one side and cooler fluid B on the other side, what is considered in the analysis?

    <p>Overall Heat-Transfer Coefficient</p> Signup and view all the answers

    What equation represents the heat flow through multiple cylindrical sections in a one-dimensional scenario?

    <p>$q = kArac{dT}{dx}$</p> Signup and view all the answers

    What is the formula used to calculate the overall heat transfer through a plane wall?

    <p>Ratio of overall temperature difference to the sum of thermal resistances</p> Signup and view all the answers

    In the context of critical thickness of insulation for a circular pipe, what does the equation for the outer radius of insulation ro aim to maximize?

    <p>Heat transfer</p> Signup and view all the answers

    Why might convection heat loss actually increase with the addition of insulation for small values of convection coefficient h?

    <p>Increased surface area</p> Signup and view all the answers

    What type of heat source system is considered in the scenario with uniformly distributed heat sources shown in Figure 2.8?

    <p>One-dimensional heat flow system</p> Signup and view all the answers

    How is the outer radius value determined to increase heat transfer according to the text?

    <p>By following a maximization condition</p> Signup and view all the answers

    What is the central concept regarding adding more insulation when the outer radius is less than the value given by a specific equation?

    <p>Increase in convection heat loss</p> Signup and view all the answers

    What is the thickness of the wall in the x direction?

    <p>2L</p> Signup and view all the answers

    In one-dimensional heat flow, what dimensions are assumed to be sufficiently large?

    <p>Length and depth</p> Signup and view all the answers

    How is heat transfer frequently removed (or delivered) in conduction-convection systems?

    <p>By convection</p> Signup and view all the answers

    In a heat-exchanger application using a finned-tube arrangement, how is heat transfer from the liquid to the finned tube accomplished?

    <p>By convection</p> Signup and view all the answers

    Which equation represents the energy balance on an element of the fin of thickness dx?

    <p>$\frac{dT}{dt} = hA(T - T_\infty)$</p> Signup and view all the answers

    What are the parameters A and P used for in the context of a fin?

    <p>To define the cross-sectional area and perimeter of the fin</p> Signup and view all the answers

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