Analysis of Entropy Generation Rate inside the Stack of Standing-wave Thermoacoustic Refrigerator

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Analysis of the Entropy Generation Rate inside a Stack of Standing-wave Thermoacoustic Refrigerator
The authors of the article presented their ideas in the article by analyzing the entropy generation rate especially inside the stack of the standing-wave by the use of a thermoacoustic refrigerator. The authors based their ideas on the law of thermodynamics by the use of the equation of the entropy generation rate near the single-plate. For the authors to attain their objective, they had to analyze the entropy generation rate against the relative position of the stack and the volume porosity. Through this analysis, the authors concluded that the entropy formation is formed because of the shift in the x-y direction of the finite temperature gradients and the irreversibility friction of the fluid.
The presentation of ideas by Xiujuan Xie, Gang Gao, and Qing Li in their article suggests that they were knowledgeable in presenting their knowledge. The authors used various techniques to satisfy their readers and other interested groups in the field of engineering. Different techniques were used by the authors to come up with a convincing conclusion concerning their research topic. For example, Xie et al. (2012) separated their research paper into different sections to present the clarity of their ideas. Also, the authors had to state their main intention in their article, give a short introduction of what to be done to achieve their objective, provided the model they used in coming up with the objectives, and lastly provided their results and conclusion based on the results.

The authors were clear in stating their intention in the introductory paragraph by stating that the objective of the authors of the article is to present the study of the irreversibility of the thermoacoustic stack by the use of the mean temperature with the boundary condition.
Also, Xie et al. (2012) provided clear information in the theoretical model by the use of diagrams, graphs, and derivation of formulas to attain an accepted conclusion. Since their study had to involve a thermoacoustic refrigerator and a single plate of parallel plate stack, the authors drew the models and used the models to derive different formulas. At the results and conclusion part of the study, the authors analyzed their findings from the formulas. The derived formulas suggested that entropy creation is produced because of the shift in the x-y direction of the finite temperature gradients and the irreversibility friction of the fluid.
However, the study of Xie et al. (2012) contains some deficiencies. For example, Xie et al. (2012) could not include a practical model to compare the theoretical model with the practical model to come up with convincing results. The authors depended on the theoretical model that is not always right when compared to the practical model. Also, the study by Xie et al. (2012) did not involve a precise procedure that can be used in case there can be a practical model for any engineer who would like to prove their theoretical model.
Based on the law of thermodynamics, I appreciate the work of the authors because they were able to use the three fundamental physical quantities that are necessary for verifying the law of thermodynamics. The quantities include energy, temperature, and entropy, and they were all explained in the article by the authors. The three fundamental quantities are essential because they characterize the thermodynamic systems such as the thermoacoustic generators. Based on my level of understanding thermodynamics, the three authors were able to prove the laws of thermodynamics by the use of the two graphs. From the graphs, we are in a position to identify the laws of thermodynamics. We can identify the law of thermodynamics from the graphs by saying that the entropy of systems moves toward a constant value when the temperature moves towards absolute zero.
Work Cited
Xie X., Gao, G., & Li, Q. Analysis of the Entropy Generation Rate inside a Stack of Standing-wave Thermoacoustic Refrigerator. 2012. Print.