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Outline
Aiming at the special flow and heat transfer issues of drilling fluid power‑law fluid，experimental testing methods were used to study the flow and heat transfer characteristics of water‑based drilling fluid in helical tubes，where the Reynolds number of drilling fluid flow ranged from 727 to 6 810，and the heat flux density ranged from 4 849 to 14 546 W/m2.The results show that the convective heat transfer coefficient and pressure drop of drilling fluid power‑law fluid both increase with Re，while the heating heat flux density has a small impact on the heat transfer coefficient and pressure drop；the obtained heat transfer Nu of drilling fluid power‑law fluid significantly deviates from the predicted values based on empirical correlations established for Newtonian fluids；the friction factor f aligns well with the predicted values of existing empirical correlations，with relative deviations within 18.11%；based on fitting experimental test data，an empirical correlation for heat transfer Nu of drilling fluid power‑law fluid was obtained，with relative deviations between predicted and experimental values less than 10%.The research results can provide references for the design of efficient and compact cooling heat exchange devices for drilling fluid power‑law fluid.
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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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