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analys a dimpled microchannel

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Old   December 1, 2018, 23:09
Default analys a dimpled microchannel
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Hi every one
i'm analysing a article that's about heat transfer in dimpled microchannel .
but i reach Nusselt number 10 % lower than based article and i couldn't get true Nu Number . i've tried different mesh but also no change . i should point that in article the Nu number is based on hydrulic diameter and i set hydrulic diameter in refrence value (length). article nusselt number is 8.21 and my Nu number is 7.2 .
i even have this promblem in flat microchannel withot any dimple .
i will attache some picture about this .
Thanks if anyone can help me.
Attached Images
File Type: jpg microchannel.jpg (80.5 KB, 5 views)
File Type: png nusselt number.PNG (37.9 KB, 4 views)
File Type: png nusselt number data.PNG (34.5 KB, 3 views)
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dimpled, microchannels, nusselt number

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