NDLI: Flow and Heat Transfer in Microchannels With Dimples and Protrusions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lan, Jibing Zhang, Di Xie, Yonghui
Copyright Year	2012
Abstract	Flow characteristics and heat transfer performances in a rectangular microchannel with dimples/protrusions are studied numerically in this research. The height and the width of the microchannel is 200 μm and 50 μm, respectively. The dimple/protrusion diameter is 100 μm, and the depth is 20 μm. The effects of Reynolds number, streamwise pitch, and arrangement pattern are examined. The numerical simulations are conducted using water as the coolant with the Reynolds number ranging from 100 to 900. The results show that dimple/protrusion technique in mcirochannel has the potential to provide heat transfer enhancement with low pressure penalty. The normalized Nusselt number is within the range from 1.12 to 4.77, and the corresponding normalized friction factor is within the range from 0.94 to 2.03. The thermal performance values show that the dimple + protrusion cases perform better than the dimple + smooth cases. The flow characteristics of the dimples/protrusions in microchannel are similar to those in conventional channel. Furthermore, from the viewpoint of energy saving, dimples/protrusions in microchannel behave better than those in conventional channel. Also from the viewpoint of field synergy principle, the synergy of the dimple + protrusion cases are much better than the dimple + smooth cases. Moreover, the synergy becomes worse with the increase in the Reynolds number and decrease in the streamwise pitch.
Starting Page	021901
Ending Page	021909
Page Count	9
File Format	PDF
ISSN	00221481
e-ISSN	15288943
Journal	Journal of Heat Transfer
Volume Number	134
Issue Number	2
DOI	10.1115/1.4005096
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2011-12-09
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Channels (Hydraulic engineering) Flow (Dynamics) Friction Heat transfer Microchannels Performance evaluation Reynolds number
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science

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