Experimental and Numerical study on the flow and heat transfer characteristic of nanofluid in the recirculation zone of backward-facing step microchannels

The heat transfer characteristic through periodical variable cross-section passage is studied with numerical scheme. The results in multi-period variable cross-section channel show that the heat transfer enhancement can be obtained by forming flow destabilization at large Reynolds number. The parameters include pressure, velocity, temperature in the channel are symmetric about central line at low Reynolds number, then change to asymmetric at high Reynolds number. The variations occur firstly at the downstream near outlet of the channel and move upstream, which could improve the fluid mixing to increase the enhancement of heat transfer in channel.

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Numerical Study on the Effect of Tube Rows on the Heat Transfer Characteristic of Dimpled Fin

Advances in Mechanical Engineering ◽

10.1155/2014/637052 ◽

2014 ◽

Vol 6 ◽

pp. 637052 ◽

Cited By ~ 1

Author(s):

Xuehong Wu ◽

Lihua Feng ◽

Dandan Liu ◽

Hao Meng ◽

Yanli Lu

Keyword(s):

Heat Transfer ◽

Heat Exchanger ◽

Heat Transfer Characteristic ◽

Average Nusselt Number ◽

Heat Transfer Performance ◽

Numerical Study ◽

Transfer Characteristic ◽

Transfer Performance ◽

Heat Transfer Characteristics ◽

Tube Heat Exchanger

The dimpled fin has excellent heat transfer performance and has attracted a lot of attention to apply on the fin and tube heat exchanger. A study presents to investigate the effects of number of tube rows on the air-side heat transfer characteristics of dimpled fin for velocity ranging from 1 to 3 m/s. The Q/Δ P and Q/((Δ P × V)) are used to evaluate the heat transfer performance of the heat exchanger. The results show that the dimpled arrangement can change the mainstream direction, increase the disturbance, and enhance the heat transfer. With the increase of the number of tube rows, the average Nusselt number decreases and Q/Δ P and Q/((Δ P × V)) increase gradually. Compared with the multipipe tube rows, the performance of two-row tube is better.

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Evaluation of the Flow and Heat Transfer Characteristic in Vertical Narrow Annulus Channel Based on the RELAPSCDAPSIM/MOD3.4 Code

Volume 4: Codes, Standards, Licensing and Regulatory Issues; Student Paper Competition ◽

10.1115/icone17-75452 ◽

2009 ◽

Author(s):

Jiange Liu ◽

Minjun Peng

Keyword(s):

Heat Transfer ◽

Heat Transfer Characteristic ◽

Nuclear Power ◽

Flow Instability ◽

Physical Phenomenon ◽

Transfer Characteristic ◽

Fluid Temperature ◽

Experiment Data ◽

Flow And Heat Transfer ◽

Temperature Heat

The physical phenomenon of the flow and heat transfer characteristic in vertical narrow annulus channel is a little different from general channel. It is valuable to improve the model veracity for exactly predicting the nuclear power system key physical phenomenon. The heat transfer characteristic of two narrow annulus channels (narrow gap 1.0mm and 1.5mm) is analyzed by means of the RELAPSCDAPSIM/MOD3.4 code recently developed by SDTP. Compared with related experiment data, the results show that the new developed code could predict key parameters such as fluid temperature, wall temperature, heat transfer coefficient, pressure drop, the occurrence condition of the flow instability and so on. The code has the ability to simulate the narrow annulus channel heat transfer characteristic.

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B131 Flow and Heat transfer Characteristic of Ice Slurries in a Coil

The Proceedings of the Thermal Engineering Conference ◽

10.1299/jsmeted.2009.47 ◽

2009 ◽

Vol 2009 (0) ◽

pp. 47-48

Author(s):

Akihiko Horibe ◽

Naoto Haruki ◽

Kuniaki Tanaka

Keyword(s):

Heat Transfer ◽

Heat Transfer Characteristic ◽

Transfer Characteristic ◽

Flow And Heat Transfer

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