Transcription of Conduction Heat transfer: Unsteady state - CHERIC
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Conduction Heat transfer: Unsteady state - CHERIC
Conduction heat transfer: Unsteady stateChapter ObjectivesFor solving the situations that Where temperatures do not change with position. In a simple slab geometry where temperature vary also with position. Near the surface of a large body (semi infinite region)Keywords Internal resistance External resistance Biot number Lumped parameter anaysis 1D and multi dimensional heat Conduction Heisler charts Semi infinite region1 Lumped Parameter AnalysisIn transient, Tr=rTr=0Tr= 1. Several temperatures in the Parameter AnalysisFigure 2. A solid with convection over its surface.) tThA(T TmCp (1)) ThA(T TmCp M : MassCp: Specific heath : Convective heat transfer coefficientA : Surface areaT : Bulk fluid temperature(1)(2)Lumped Parameter Analysis(3)Lumped Parameter Analysis(5)(4)2 Biot NumberTr=rTr= 3. Several temperatures in the , when can we apply ?Biot NumberBi (Biot Number) : Deciding whether internal resistance can be ignored.
6 Chapter Summary‐Transient Heat Conduction •No Internal Resistance, Lumped Parameter 1. The thermal resistance of the solid can be ignored if a Biot number is less than 0.1. 2. As thermal resistances are ignored, temperature is a function of time only. •
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