Conjugated Heat Transfer of Power-Law Fluids in Counterflow Concentric-Tube Heat Exchangers with Sinusoidal Wall Fluxes
| Autor: | Li-Pang Lin, 林立邦 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 A new design of heating the power-law fluid with sinusoidal wall fluxes was obtained inserting in parallel an impermeable sheet into a concentric tube to conduct double-pass operations. The mathematical formulation of counterflow double-pass concentric-tube heat exchanger under sinusoidal wall fluxes, as referred to conjugated Graetz problem was achieved by using the Frobenius method. The theoretical predictions show that the improvement of the double-pass device performance with the significant heat-transfer efficiency improvement was represented graphically, and heat transfer enhancement of double-pass concentric circular heat exchangers is generally higher than that in the single-pass operations (without an impermeable sheet inserted). The results show that introducing recycle operation can enhance the heat-transfer efficiency in designing double-pass concentric-tube heat exchangers with sinusoidal wall heat fluxes. The effects of power index, impermeable-sheet position, recycle ratio and power consumption increment for heating power-law fluids in the double-pass concentric tube heat exchanger have also been presented. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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