Effect of Shear Work on Heat Transfer Characteristics of Gaseous Flow Between Two Micro-parallel Plates

2022 ◽  
pp. 1397-1407
Author(s):  
Prathuk Balachandra Hegde ◽  
Hari Mohan Kushwaha
Keyword(s):  
Heat Transfer ◽  
Parallel Plates ◽  
Heat Transfer Characteristics ◽  
Gaseous Flow ◽  
Transfer Characteristics

Heat Transfer Characteristics of Gaseous Flow in a Micro-Tube

2004 ◽  
Author(s):  
Yutaka Asako
Keyword(s):  
Heat Transfer ◽  
Incompressible Flow ◽  
Bulk Temperature ◽  
Stagnation Temperature ◽  
Arbitrary Lagrangian Eulerian ◽  
Heat Transfer Characteristics ◽  
Gaseous Flow ◽  
Transfer Characteristics ◽  
Total Temperature ◽  
Energy Equations

Two-dimensional compressible momentum and energy equations are solved numerically to obtain the heat transfer characteristics of gaseous flow in a micro-tube with isothermal wall. The numerical methodology is based on the Arbitrary-Lagrangian-Eulerian (ALE) method. The stagnation temperature is fixed at 300 K and the computations were done for the wall temperatures of 305 K, 310 K and 350 K. The bulk temperature based on the static temperature is compared with that of the incompressible flow in a conventional sized tube. The static bulk temperature of the gaseous flow in a micro-tube decreases approaching to the outlet due to the energy conversion into the kinetic energy, when flow is fast. The total temperatures are also compared witht he bulk temperature of the incompressible flow in a conventional sized tube. The total temperature is slightly higher than the bulk temperature of the incompressible flow. This is due to the additional heat transfer near the outlet. A correlation for the prediction of the heat transfer rate of the gaseous flow in the micro tube is proposed.

Heat Transfer Characteristics of Compressible Laminar Flow Through Microtubes

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Chungpyo Hong ◽  
Takaharu Yamamoto ◽  
Yutaka Asako ◽  
Koichi Suzuki
Keyword(s):  
Heat Transfer ◽  
Wall Temperature ◽  
Gas Flow ◽  
Atmospheric Condition ◽  
Stagnation Temperature ◽  
Heat Transfer Characteristics ◽  
Constant Wall Temperature ◽  
Gaseous Flow ◽  
Transfer Characteristics ◽  
Flow Through

This paper describes experimental results on heat transfer characteristics of gaseous flow in a microtube with constant wall temperature. The experiments were performed for nitrogen gas flow through three microtubes of 123 μm, 163 μm, and 243 μm in diameter with 50mm in length, respectively. The wall temperature was maintained at 310 K, 330 K, and 350 K by circulating water around the microtube, respectively. The stagnation pressure is chosen in such a way that the exit Mach number ranges from 0.1 to 1.0. The outlet pressure was fixed at the atmospheric condition. The total temperature at the outlet, the inlet stagnation temperature, the mass flow rate, and the inlet pressure were measured. The numerical computations based on the Arbitrary-Lagrangian-Eulerian (ALE) method were also performed with the same conditions of the experiment for validation of numerical results. Both the results are in excellent agreement. In some cases, the total temperatures obtained by the present experimental study are higher than the wall temperature. This is due to the additional heat transfer from the wall to the gas near the microtube outlet caused by the temperature fall due to the energy conversion into the kinetic energy. A quantitative correlation for the prediction of the heat transfer rate of the gaseous flow in microtubes which had been proposed in our previous study (Hong and Asako, 2007, “Heat Transfer Characteristics of Gaseous Flows in a Microchannel and a Microtube with Constant Wall Temperature,” Numer. Heat Transfer, Part A, 52, pp. 219–238) was validated.

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