ENTROPY GENERATION INVESTIGATION OF POROUS MEDIA WITH PORE SCALE MODELING

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Torabi Mehrdad; Jafari Yaser; Taeibi Rahni Mohammad

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Seminar Paper

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Seminar: CONFERENCE OF IRANIAN AEROSPACE SOCIETY
Year:2016 | Issue:15

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Title

ENTROPY GENERATION INVESTIGATION OF POROUS MEDIA WITH PORE SCALE MODELING

Author(s)

Torabi Mehrdad | Jafari Yaser | Taeibi Rahni Mohammad | Issue Writer Certificate

Keywords

ENTROPY GENERATION

HEAT TRANSFER

POROUS MEDIA

LAMINAR FLOW

PERIODIC BOUNDARY CONDITION

Abstract

THERMAL INVESTIGATION OF THERMOFLUID SYSTEMS WITH THE SECOND LAW OF THERMODYNAMICS HAS INTERESTED RESEARCHERS AND ENGINEERS FROM DIFFERENT DISCIPLINES. THIS STUDY AIMS TO INVESTIGATE ENTROPY GENERATION IN POROUS MEDIA WITH PORE SCALE MODELING. ONE REPRESENTATIVE VOLUME HAS BEEN SELECTED FOR REDUCING CPU TIME. PERIODIC BOUNDARY CONDITIONS ARE APPLIED TO VERTICAL BOUNDARIES BY RE-INJECTING VELOCITY AND TEMPERATURE PROFILES FROM OUTLET TO INLET. THIS PROCESS IS REPEATED UNTIL INLET AND OUTLET VELOCITY DISTRIBUTIONS BECOME IDENTICAL. THIS STUDY SURVEYS ENTROPY GENERATION FOR CIRCLE AND SQUARE CROSS-SECTIONS WITH DIFFERENT RE NUMBERS AND POROSITIES. RE NUMBER VARIES FROM DARCY REGIME TO FORCHHEIMER REGIME WITH MAXIMUM OF 200. THERE ARE THREE POROSITIES FOR EACH CROSS-SECTION. MOREOVER, PERFORMANCE EVALUATION COEFFICIENT (PEC) IS CALCULATED WHICH IS A COMBINATION OF THE FIRST LAW AND SECOND LAW OF THERMODYNAMICS. HAVING MEASURED THIS PARAMETER FOR DIFFERENT CASE STUDIES, IT IS REVEALED THAT FOR LOW FLOWS LEAST POROSITY MEDIUM GIVES THE BEST THERMAL PERFORMANCE. FOR LOW RE FLOWS, IT IS OBSERVED THAT LOWER POROSITIES RESULT IN BETTER HEAT TRANSPORT AND FOR HIGHER RE FLOWS, SELECTING THE POROSITY OF MEDIUM DEPENDS ON RE NUMBER OF FLOW. ALSO, IT IS NOTICEABLE THAT PEC IS HIGHER FOR SQUARE CROSS-SECTION. THE OUTCOMES OF THIS STUDY COULD BE HELPFUL FOR DESIGNERS AND ENGINEERS WHO WORK IN HEAT EXCHANGER INDUSTRY. IT IS NOTICEABLE THAT THERE SHOULD BE OPTIMUM SPACE BETWEEN THE TUBES OR ONE CAN SAY THE RE NUMBER THAT PRODUCES THE LEAST ENTROPY GENERATION.

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APA: Copy

Torabi, Mehrdad, Jafari, Yaser, & Taeibi Rahni, Mohammad. (2016). ENTROPY GENERATION INVESTIGATION OF POROUS MEDIA WITH PORE SCALE MODELING. CONFERENCE OF IRANIAN AEROSPACE SOCIETY. SID. https://sid.ir/paper/947941/en

Vancouver: Copy

Torabi Mehrdad, Jafari Yaser, Taeibi Rahni Mohammad. ENTROPY GENERATION INVESTIGATION OF POROUS MEDIA WITH PORE SCALE MODELING. 2016. Available from: https://sid.ir/paper/947941/en

IEEE: Copy

Mehrdad Torabi, Yaser Jafari, and Mohammad Taeibi Rahni, “ENTROPY GENERATION INVESTIGATION OF POROUS MEDIA WITH PORE SCALE MODELING,” presented at the CONFERENCE OF IRANIAN AEROSPACE SOCIETY. 2016, [Online]. Available: https://sid.ir/paper/947941/en

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