Full
Outline
Aiming at the special flow and heat transfer characteristics of water‑based drilling fluid power‑law fluid，a combined method of experimental and numerical simulation was adopted to systematically study the flow and heat transfer behavior of power‑law fluid in serpentine channels.The experimental research was conducted within the Reynolds number （Re） range of 200~600，and the results show that the power‑law fluid still maintains high viscosity in this interval，with both convective heat transfer coefficient and pressure drop increasing with flow velocity，among which the maximum increase of convective heat transfer coefficient is 29.9%，and the maximum increase of pressure drop is 40.5%.The numerical simulation part covers the range of Re=240~2 900，when the Re value increases from 700 to 2 900，the Nusselt number （Nu） increases by 290.2%，while the pressure drop only increases by 109.9%.By comparing the flow and heat transfer characteristics of serpentine channels and straight channels，it is found that when Re≤700，the difference in Nu values between the two is small；when Re>700，the heat transfer performance improvement of serpentine channels is significantly higher than that of straight channels.In addition，the Nu value of power‑law fluid in plate structures gradually deviates from the calculated values based on empirical correlations for Newtonian fluids as the Re value increases，and is generally lower than the prediction results of traditional empirical formulas.The research can provide references for the optimal design of efficient and compact drilling fluid heat exchange devices on offshore drilling platforms.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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