CONVECTIVE HEAT TRANSFER COEFFICIENTS IN GEOMETRIES OF COMPLEX SHAPE: EXPERIMENTAL MEASUREMENT USING A MASS TRANSFER ANALOGUE TECHNIQUE

1970 ◽  
Author(s):  
S. B. H. C. Neal ◽  
E. W. Northover ◽  
J. A. Hitchcock
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Experimental Measurement ◽  
Complex Shape ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Convective Heat Transfer Coefficients

Prediction of convective heat transfer coefficients for the upper respiratory tracts of rat, dog, monkey, and humans

2016 ◽  
Vol 26 (6) ◽  
pp. 828-840 ◽  
Author(s):  
Kazuhide Ito ◽  
Koki Mitsumune ◽  
Kazuki Kuga ◽  
Nguyen L Phuong ◽  
Kenji Tani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Mass Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Upper Airway ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Convective Heat Transfer Coefficients

In vivo studies involving mammal surrogate models for toxicology studies have restrictions related to animal protection and ethics. Computer models, i.e., in silico models, have great potential to contribute towards essential understanding of heat and mass transfer phenomena in respiratory tracts in place of in vivo and in vitro studies. Here, we developed numerical upper airway models of a rat, a dog, a monkey, and two humans by using computed tomography data and then applied computational fluid dynamics analysis. Convective heat transfer coefficients were precisely analysed as a function of breathing airflow rate. Based on the computational fluid dynamics simulation results, the correlations between Nusselt ( Nu) number and the product of the Reynolds ( Re) and Prandtl ( Pr) numbers were summarized. The heat transfer efficiency (order of hc and correlation of Nu and RePr) in the upper airway of the dog seems to match those of the human models. On the other hand, the results for the rat and monkey showed clear differences compared with those of human models. The identified fundamental qualities of convective heat transfer phenomena in airways for rats, dogs, monkeys, and humans, have enabled discussions about quantitative differences of heat and mass transfer efficiency between different animals/species.

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