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CONVECTIVE-RADIATIVE HEAT TRANSFER IN THE THERMAL ENTRANCE REGION OF THE SEMICIRCULAR DUCT WITH STREAMWISE INTERNAL FINS.

Author(s) : ZHANG H. Y., EBADIAN M. A.

Type of article: Article

Summary

IN THE PAPER, STEADY LAMINAR FORCED CONVECTION AND RADIATION HEAT TRANSFER IN THE ENTRANCE REGION OF AN INTERNALLY FINNED SEMICIRCULAR DUCT ARE ANALYZED. THE FINS ARE CONTINUOUS AND LONGITUDINAL, WITH ZERO THICKNESS. THE THERMAL CONDITION IMPOSED ON THE SEMICIRCULAR DUCTS IS OF UNIFORM TEMPERATURE, BOTH AXIALLY AND PERIPHERALLY. THE THREE-DIMENSIONAL ENERGY EQUATION IS DISCRETIZED AND SOLVED NUMERICALLY BY THE METHOD OF LINES. THE METHOD OF MOMENTUM IS EMPLOYED TO CONSIDER THE RADIATION CONTRIBUTION, WHICH MODELS THE RADIATION IN THE PARTIAL DIFFERENTIAL EQUATION, INSTEAD OF THE PARTIAL INTEGRO-DIFFERENTIAL EQUATION. THE RESULTING EQUATIONS, BASED ON COARSE GRIDS, ARE NUMERICALLY COMPUTED, USING A RUNGE-KUTTA SUBROUTINE. THE EFFECT OF 5 MAJOR PARAMETERS ON THE THERMAL BEHAVIOUR IN THE ENTRY REGION OF THE SEMICIRCULAR DUCT IS DISCUSSED: RADIATION-CONDUCTION ; OPTICAL THICKNESS ; WALL EMISSIVITY ; NUMBER OF FINS ; AND RATIO OF FIN ULK TEMPERATURE AND TOTAL NUSSELT NUMBERS SHOW THAT HEAT TRANSFER IS ENHANCED IN THIS GEOMETRY BY BOTH THERMAL RADIATION AND FINS.

Details

  • Original title: CONVECTIVE-RADIATIVE HEAT TRANSFER IN THE THERMAL ENTRANCE REGION OF THE SEMICIRCULAR DUCT WITH STREAMWISE INTERNAL FINS.
  • Record ID : 1992-1567
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 34 - n. 12
  • Publication date: 1991/12

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