presentacion conduccion linear
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presentacion del laboratorio de conduccion linearTRANSCRIPT
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POLYTECHNIC UNIVERSITY OF PUERTO RICOHATO REY, PUERTO RICO
DEPARTMENT OF CHEMICAL ENGINEERINGSPRING 2014
LINEAR CONDUCTION
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Agenda• Introduction• Objectives• Theory• Equipment• Procedure• Data• Calculations• Expected Results• Safety Rules• References
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Introduction• Heat Transfer
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Introduction• Modes of heat transfer• Conduction • Convection • Radiation
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Objectives• To understand the use of the Fourier Rate Equation in determining rate of heat flow through solid materials for one-dimensional steady flow of heat.
• To measure the temperature distribution for steady-state conduction of energy through a composite plane wall and determine the Overall Heat Transfer Coefficient for the flow of heat through a combination of different materials in series
• To determine the thermal conductivity k (the constant of proportionality) of a metal specimen (good conductor)
• To demonstrate that temperature gradient is inversely proportional to the cross-sectional area for one-dimensional flow of heat in a solid material of constant thermal conductivity
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Theory
Conduction – One dimensional heat conduction analysis
J. P. Holman. Heat Transfer Tenth Edition. (2009)
𝑄=−𝑘𝐴 𝑑𝑡𝑑𝑥
Where,
k is the thermal conductivity of the material
A is the cross sectional area normal to direction of heat flow
is the temperature gradient of the selection
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Theory
𝑞𝑥=(𝑇 2−𝑇 1)
𝑥𝑘𝐴
=(𝑇 2−𝑇1 )𝑅 h𝑡
Conduction – One dimensional heat conduction analysis
J. P. Holman. Heat Transfer Tenth Edition. (2009)
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Theory
• Thermal conductivity of various materials at 0°C
J. P. Holman. Heat Transfer Tenth Edition. (2009)
𝑘=𝑞∆ 𝑥𝐴∆𝑇
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Theory
J. P. Holman. Heat Transfer Tenth Edition. (2009)
Conduction – One dimensional heat conduction analysis using more than one material
𝑞=𝑇1−𝑇 4
∆ 𝑥𝐴
𝑘𝐴 𝐴+∆𝑥𝐵
𝑘𝐵𝐴+∆ 𝑥𝐶
𝑘𝐶 𝐴
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Theory
Overall Heat Transfer Coefficient
• Where, • +
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Theory
Conduction – one dimensional heat flow through a cylinder
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Equiment
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Procedure
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Data
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Calculus
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Safety
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References
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