3c-r - Extended Surfaces Chapter Three Section 3.6 Nature...

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Extended Surfaces Extended Surfaces Chapter Three Chapter Three Section 3.6 Section 3.6
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Nature and Rationale Nature and Rationale Nature and Rationale of Extended Surfaces • An extended surface (also know as a combined conduction-convection system or a fin ) is a solid within which heat transfer by conduction is assumed to be one dimensional , while heat is also transferred by convection ( and/or radiation ) from the surface in a direction transverse to that of conduction. – Why is heat transfer by conduction in the x - direction not , in fact , one- dimensional? – If heat is transferred from the surface to the fluid by convection , what surface condition is dictated by the conservation of energy requirement?
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Nature and Rationale (Cont.) Nature and Rationale (Cont.) – What is the actual functional dependence of the temperature distribution in the solid? – If the temperature distribution is assumed to be one-dimensional, that is, T=T(x) , how should the value of T be interpreted for any x location? – How does vary with x ? , cond x q – When may the assumption of one-dimensional conduction be viewed as an excellent approximation? The thin-fin approximation . • Extended surfaces may exist in many situations but are commonly used as fins to enhance heat transfer by increasing the surface area available for convection (and/or radiation). They are particularly beneficial when is small, as for a gas and natural convection.
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This note was uploaded on 04/02/2008 for the course MAE 310 taught by Professor Kuznetsov during the Spring '08 term at N.C. State.

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3c-r - Extended Surfaces Chapter Three Section 3.6 Nature...

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