Suppression of flame instability by a short catalytic segment on the wall of a micro channel with a prescribed wall temperature profile

Fuel ◽  
2018 ◽  
Vol 234 ◽  
pp. 1329-1336 ◽  
Author(s):  
Shixuan Wang ◽  
Linhong Li ◽  
Aiwu Fan
Keyword(s):  
Temperature Profile ◽  
Wall Temperature ◽  
Micro Channel ◽  
Flame Instability

The Infrared Characteristics of the Wall Temperature of Boiling Heat Transfer in Microchannel

2011 ◽  
Vol 383-390 ◽  
pp. 811-815
Author(s):  
Hu Gen Ma ◽  
Jian Mei Bai ◽  
Rong Jian Xie ◽  
Wen Jing Tu
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Wall Temperature ◽  
Boiling Heat Transfer ◽  
Transfer Test ◽  
Axial Direction ◽  
Transfer Model ◽  
Micro Channel ◽  
Vapor Quality ◽  
Test Rig

In this paper, the boiling heat transfer test rig was designed and built, while the characteristics of boiling Heat Transfer of refrigerants in micro-channel was researched. The wall temperature of micro-channel was measured by TH5104 Infrared thermography. The results showed that there were obvious variations for wall temperature of micro-channel along the axial direction when boiling heat transfer occurred in the micro-channel. The temperature distribution affected obviously by the heat flux, mass flow rate; vapor quality and heat transfer model.

scholarly journals Passive generation from a novel thermoelectric energy harvesting system model integrated with phase change material

2019 ◽  
Vol 111 ◽  
pp. 03060
Author(s):  
Yoo-Suk Byon ◽  
Hansol Lim ◽  
Yong-Kwon Kang ◽  
Soo-Yeol Yoon ◽  
Jae-Weon Jeong
Keyword(s):  
Phase Change ◽  
Temperature Profile ◽  
Phase Change Material ◽  
Temperature Difference ◽  
Wall Temperature ◽  
Waste Heat ◽  
Thermoelectric Energy ◽  
Temperature Method ◽  
Thermoelectric Energy Harvesting ◽  
Change Material

The purpose of this research is to evaluate the performance of a novel model that incorporates a thermoelectric generator (TEG) and phase change material (PCM). The proposed model passively generates electricity using waste heat that accumulates at exterior wall surfaces. The main generator is a TEG. To maintain the temperature difference between the two sides of the TEG, PCM is located at its cold side—thus converging the heat transferred into latent heat. The proposed passive generation system is formed into a TEG-PCM block. The block can be stacked to form a wall or inserted into any part of a building that faces the sun. The experiment setup is based on a constant temperature method. The wall temperature profile is set according to solar radiation, convection, and radiative heat transfer. To replicate daily wall temperatures during the experiment, a heat plate is used to match a wall temperature profile. Step control was used for the heating plate. The resulting data shows the average temperature difference between the hot and cold sides of the TEG to be 10-20°C. The peak generated electricity was 0.08 W for a single module.

Flame Chromatography: Toward Fuel Indexing Based on Multiple Weak Flames in a Meso-Scale Channel With a Prescribed Temperature Profile

2011 ◽  
Author(s):  
Kaoru Maruta
Keyword(s):  
Temperature Profile ◽  
Wall Temperature ◽  
Wide Temperature Range ◽  
Ignition Temperature ◽  
Flame Stability ◽  
Research Octane Number ◽  
Multi Stage ◽  
Auto Ignition ◽  
First Time ◽  
Meso Scale

For understanding flame stability in microcombustor, fundamental studies on the combustion characteristics in a meso-scale channel with a prescribed wall temperature profile have been conducted. Results showed that the existence of dynamic oscillatory flames and weak flames in addition to the normal propagating flames for the first time. It is then recognized that the weak flame phenomena can be applied for examining multi-stage oxidation of hydrocarbon fuels in wide temperature range from 300K up to auto-ignition temperature. Based on the preliminary experiments with various fuels including primary referenced fuel for gasoline, research octane number (RON) of the test fuels can be clearly described by the aspects of the stabilized stationary multiple weak flames. The methodology can be termed “flame chromatography” and it is expected to be applied for fuel indexing of future alternative fuel characterizations.

scholarly journals Investigation of electroosmosis flow of copper nanoparticles with heat transfer due to metachronal rhythm

2021 ◽  
Vol 25 (Spec. issue 2) ◽  
pp. 193-198
Author(s):  
Ali Imran ◽  
Asif Waheed ◽  
Shumaila Javeed ◽  
Dumitru Baleanu ◽  
Muhammad Zeb ◽  
...  
Keyword(s):  
Pressure Gradient ◽  
Temperature Profile ◽  
Equations Of Motion ◽  
Potential Temperature ◽  
Pressure Rise ◽  
Axial Direction ◽  
Micro Channel ◽  
Flow Parameters ◽  
Ciliary Motion ◽  
Axial Pressure Gradient

A mathematical model is explored to establish the electroosmotic flow for Cu-wa-ter nanoliquids within a ciliated symmetric micro-channel, the flow is established with aid of ciliary motion and axial pressure gradient. Nanofluid comprise of Cu as a nanofluid particles and water as base fluid. Maxwell-Garnelt model is exploited for viscosity and thermal conductivity of nanoliquid. Magnetic field is applied in the transverse direction and external electric field is enforced in the axial direction. Equations of motion are simplified for nanofluid flow in the micro-channel by employing low Reynolds number and long wavelength approximation theory. Crucial exact analytical expression are gathered for electric potential, temperature profile, axial velocity, volume flux, pressure gradient, stream function, and result for pressure rise per wavelength explored numerically. The influence of crucial flow parameters on, flow behaviour, pumping phenomena, and temperature profile are thoroughly investigated.

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