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>$1/hA$ (C)</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 (A)</p> Signup and view all the answers

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

<p>$q = kArac{dT}{dx}$ (B)</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 (A)</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 (A)</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 (C)</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 (C)</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 (C)</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 (D)</p> Signup and view all the answers

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

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

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

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

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

<p>By convection (A)</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 (C)</p> Signup and view all the answers

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

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

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