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    Heat Transfer and Pressure Drop Correlations for Square Channels With 45 Deg Ribs at High Reynolds Numbers

    Source: Journal of Heat Transfer:;2009:;volume( 131 ):;issue: 007::page 71703
    Author:
    Akhilesh P. Rallabandi
    ,
    Huitao Yang
    ,
    Je-Chin Han
    DOI: 10.1115/1.3090818
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Systematic experiments are conducted to measure heat transfer enhancement and pressure loss characteristics on a square channel (simulating a gas turbine blade cooling passage) with two opposite surfaces roughened by 45 deg parallel ribs. Copper plates fitted with a silicone heater and instrumented with thermocouples are used to measure regionally averaged local heat transfer coefficients. Reynolds numbers studied in the channel range from 30,000 to 400,000. The rib height (e) to hydraulic diameter (D) ratio ranges from 0.1 to 0.18. The rib spacing (p) to height ratio (p/e) ranges from 5 to 10. Results show higher heat transfer coefficients at smaller values of p/e and larger values of e/D, though at the cost of higher friction losses. Results also indicate that the thermal performance of the ribbed channel falls with increasing Reynolds numbers. Correlations predicting Nusselt number (Nu) and friction factor (f¯) as a function of p/e, e/D, and Re are developed. Also developed are correlations for R and G (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number (e+), p/e, and e/D.
    keyword(s): Friction , Heat transfer , Channels (Hydraulic engineering) , Reynolds number , Heat transfer coefficients , Pressure drop , Flow (Dynamics) AND Copper ,
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      Heat Transfer and Pressure Drop Correlations for Square Channels With 45 Deg Ribs at High Reynolds Numbers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/141026
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    contributor authorAkhilesh P. Rallabandi
    contributor authorHuitao Yang
    contributor authorJe-Chin Han
    date accessioned2017-05-09T00:33:45Z
    date available2017-05-09T00:33:45Z
    date copyrightJuly, 2009
    date issued2009
    identifier issn0022-1481
    identifier otherJHTRAO-27865#071703_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141026
    description abstractSystematic experiments are conducted to measure heat transfer enhancement and pressure loss characteristics on a square channel (simulating a gas turbine blade cooling passage) with two opposite surfaces roughened by 45 deg parallel ribs. Copper plates fitted with a silicone heater and instrumented with thermocouples are used to measure regionally averaged local heat transfer coefficients. Reynolds numbers studied in the channel range from 30,000 to 400,000. The rib height (e) to hydraulic diameter (D) ratio ranges from 0.1 to 0.18. The rib spacing (p) to height ratio (p/e) ranges from 5 to 10. Results show higher heat transfer coefficients at smaller values of p/e and larger values of e/D, though at the cost of higher friction losses. Results also indicate that the thermal performance of the ribbed channel falls with increasing Reynolds numbers. Correlations predicting Nusselt number (Nu) and friction factor (f¯) as a function of p/e, e/D, and Re are developed. Also developed are correlations for R and G (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number (e+), p/e, and e/D.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHeat Transfer and Pressure Drop Correlations for Square Channels With 45 Deg Ribs at High Reynolds Numbers
    typeJournal Paper
    journal volume131
    journal issue7
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.3090818
    journal fristpage71703
    identifier eissn1528-8943
    keywordsFriction
    keywordsHeat transfer
    keywordsChannels (Hydraulic engineering)
    keywordsReynolds number
    keywordsHeat transfer coefficients
    keywordsPressure drop
    keywordsFlow (Dynamics) AND Copper
    treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 007
    contenttypeFulltext
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