Combustion of propane with Pt and Rh catalysts in a meso-scale heat recirculating combustor

Wierzbicki, Teresa A.; Lee, Ivan C.; Gupta, Ashwani K.

doi:10.1016/j.apenergy.2014.05.069

Cited by 76 publications

(21 citation statements)

References 28 publications

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“…is is due to the potential to lose more available energy at high gas temperatures. Equation (10) was used to generate the exergy destruction results under various rib positions and heights, as presented in Figure 12. It is easy to see that the exergy destruction decreases drastically at l � 6/9 and r � 0.4. e results presented in Figures 10 and 13 are both obtained at H 2 and air mass flow rates maintained at 1.347 × 10 − 7 kg/s and 4.632 × 10 − 6 kg/s, respectively, and H 2 /air equivalent ratio of 1.0. e change trend is the same as the outer wall temperature change trend.…”

Section: Effects Of Annular Rectangular Rib On Field Entropymentioning

confidence: 99%

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Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Wang

Fang

Lou

et al. 2020

Journal of Chemistry

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Micro-combustor can provide the required thermal energy of micro-thermal photovoltaic (MTPV) systems. The performance of MTPV is greatly affected by the effectiveness of a micro-combustor. In this study, a numerical simulation was conducted to explore the benefits of annular rectangular rib for enhancing the thermal performance of a nonpremixed micro-combustor. Based on the investigations under various rib heights, rib positions, and inlet mass flow rates, it is found that the addition of annular rectangular ribs in the micro-combustor creates a turbulent zone in the combustion chamber, thereby enhancing the heat transfer efficiency between the inner wall of the combustion chamber and the burned gas. The micro-combustor with annular rectangular rib shows a higher and more uniform wall temperature. When the H2 mass flow is 7.438 × 10−8 kg/s and the air mass flow is 2.576 × 10−6 kg/s, the optimum dimensionless rib position is at l = 6/9 and r = 0.4. At this condition, the micro-combustor has the most effective and uniform heat transfer performance and shows significant decreases in entropy generation and exergy destruction. However, the optimum l and r significantly depend on the inlet mass flow of H2/air mixture.

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Section: Effects Of Annular Rectangular Rib On Field Entropymentioning

confidence: 99%

“…Pan et al [2] and Li et al [3][4][5] improved flame stability in the microchannel by enhancing heat transfer. Catalytic combustion can be used to improve fuel conversion efficiency [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Wang

Fang

Lou

et al. 2020

Journal of Chemistry

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“…3. [38][39][40] It is inhibited by heterogeneous reaction in catalytic condition, and can be ignored in most cases. 4.…”

Section: Stability Limitsmentioning

confidence: 99%

Stability limits and chemical quenching of methane–air flame in plane micro-channels with different walls

Chen

Gao

2015

RSC Adv.

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In order to elucidate the effects of wall material on stability limits and chemical quenching behavior, plane micro-channels with different wall materials were evaluated for the premixed combustion of methane-air.Experiments and numerical simulations with detailed chemistry kinetics schemes were carried out to explore the combustion characteristics along with the interaction between homogeneous and surface reactions on platinum, quartz glass, alumina ceramic and copper, and to estimate the effect of initial sticking coefficients associated with radical adsorption on chemical quenching. The experimental results indicate that the stability limits decrease in the order of platinum > copper > quartz glass > alumina ceramic for the different wall materials. The lower thermal conductivity wall leads to higher reaction temperature, which enhances the robustness of micro-flame. The simulation results indicate that chemical effect plays a critical role in the distribution of OH* radical. Homogeneous reaction is significantly inhibited on the platinum surface because of the depletion of reactants rather than the radical adsorption. Radical quenching is the most inhibited on the surface of alumina ceramic. The wall chemical effect on flame becomes very important as micro-channel is smaller than 0.7 mm.

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“…Vijayan et al [11] studied the importance of heat recirculation on meso scale combustor by performing a detailed parametric study on combustor performance by varying the combustor material, inlet conditions etc. Thorough investigations on various aspects of flame stabilization in swiss roll combustor by Shirsat and Gupta [13] and Wierzbicki et al [14] indicate that extended extinction limits and combustion stability can be achieved with proper thermal management in the swiss roll combustors. This concept in the context of thrust generation for various applications such as small robotics and nanosatellites also explored by same research group using methanol as fuel [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

2018

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A new concept of dual microcombustor based thermoelectric micropower generator with high power density (~0.14 mW/mm 3) and high conversion efficiency (4.66 %) is reported in this work. A new configuration with a dual microcombustor system is experimentally investigated with two thermoelectric modules and operates with liquefied petroleum gas as fuel. The dual microcombustor is fabricated using a rectangular aluminium metal block and detailed investigations on flame stability limits and thermal characteristics were carried out. Dual microcombustor configuration helps to significantly improve the flame stability limits and thermal characteristics over the single combustor configuration due to increased flame-surface interaction and enhanced heat recirculation through solid walls. Maximum power point tracking (MPPT) algorithm is applied to achieve a maximum power output of 4.52 W with a maximum conversion efficiency of 4.66 %. The application of porous media significantly helped improve the upper flame stability limits with a maximum conversion efficiency of 4.32 %, and 4.66 %, at  = 1 and 0.9 respectively at 10 m/s mixture velocity. The system compactness and high output power with significantly improved conversion efficiency shows the possibility of its application in various portable micro-scale power generators for remote, stand-alone, military and aerospace applications.

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Combustion of propane with Pt and Rh catalysts in a meso-scale heat recirculating combustor

Cited by 76 publications

References 28 publications

Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Exploring the Benefits of Annular Rectangular Rib for Enhancing Thermal Efficiency of Nonpremixed Micro-Combustor

Stability limits and chemical quenching of methane–air flame in plane micro-channels with different walls

Experimental investigations on a new high intensity dual microcombustor based thermoelectric micropower generator

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