scholarly journals Correction to: thermal conductivity of porous sintered metal powder and the Langmuir shape factor

2021 ◽  
Author(s):  
Osama M. Ibrahim ◽  
Ahmed H. Al-Saiafi ◽  
Sorour Alotaibi
Keyword(s):  
Thermal Conductivity ◽  
Metal Powder ◽  
Shape Factor ◽  
Sintered Metal

Thermal conductivity of porous sintered metal powder and the Langmuir shape factor

2021 ◽  
Author(s):  
Osama M. Ibrahim ◽  
Ahmed H. Al-Saiafi ◽  
Sorour Alotaibi
Keyword(s):  
Thermal Conductivity ◽  
Metal Powder ◽  
Shape Factor ◽  
Sintered Metal

Influence of Shape of Nanoparticles on Nanofluid Hydrothermal Behavior

2018 ◽  
pp. 331-388
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Finite Element Method ◽  
Finite Element ◽  
Stream Function ◽  
Shape Factor ◽  
Control Volume ◽  
Flow And Heat Transfer ◽  
Shape Of Nanoparticles ◽  
Stream Function Formulation

The shape of nanoparticles can change the thermal conductivity of nanofluid. So, the effect of shape factor on nanofluid flow and heat transfer has been reported in this chapter. Governing equations are presented in vorticity stream function formulation. Control volume-based finite element method (CVFEM) is utilized to obtain the results. Results indicate that platelet shape has the highest rate of heat transfer.

Enhancement in the Effective Thermal Conductivity in Rat Spinotrapezius Due to Vasoregulation

1997 ◽  
Vol 119 (4) ◽  
pp. 461-468 ◽  
Author(s):  
J. Song ◽  
L. X. Xu ◽  
D. E. Lemons ◽  
S. Weinbaum
Keyword(s):  
Thermal Conductivity ◽  
Blood Flow ◽  
Effective Thermal Conductivity ◽  
Shape Factor ◽  
Infinite Medium ◽  
Vascular Structure ◽  
Number Density ◽  
Local Blood Flow ◽  
Vasoactive Agents ◽  
Fivefold Increase

This study was undertaken to gain a better understanding of the countercurrent heat exchange of thermally significant blood vessels in skeletal muscle by measuring the vascular structure and flow in an exteriorized rat spinotrapezius muscle and estimating the enhancement in the effective thermal conductivity of the muscle. Detailed anatomic measurements of the number density and length of countercurrent vessel pairs between 45 and 165 μm diameter were obtained. Moreover, diameter and blood flow in the 1A to 3A vessels were measured for muscles in which pharmacological vasoactive agents were introduced, allowing one to vary the local blood flow Peclet number from 1 to 18 in the major feeding arteries. These combined measurements have been used to estimate the range of possible enhancement in the effective thermal conductivity of the tissue. The newly derived conduction shape factor in Zhu et al. [23] for countercurrent vessels in two-dimensional tissue preparations was used in this analysis. Our experimental data indicated that the value of this conduction shape factor was about one-third to two-thirds the value for two countercurrent vessels of the same size and spacing in an infinite medium. The experiment also revealed that the Weinbaum–Jiji expression for keff was valid for the spinotrapezius muscle when the largest vessels were less than 195 μm diameter. A fivefold increase in keff was predicted for 195 μm diameter vessels. Vasoregulation was also shown to have a dramatic effect on keff. A tissue that exhibits only small increases in keff due to countercurrent convection in its vasoconstricted state can exhibit a more than fivefold increase in Keff in its vasodilated state.

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