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Thread groove tube heat transfer and pressure drop characteristics of the experimental study


. . . . . . . . . . . . . . . . . -. . . . . . . . r-L 1 Huang Wei-Tong et al: Lo grave protracted resistance characteristics of heat transfer and experimental study Nu: 2.7o31 (~-)( dry) Ⅲ. 76c ~,[link widoczny dla zalogowanych], p (3) type (3) For the tube convection correlation, Nu is the number of cooling water Nuxieerte; Pr Prandtl number for the cooling water side. Scope: 0.02523 0.05 for all threaded shaft B30 have obvious effect of enhanced heat transfer, especially in e / p = 0.1021 for 6,[link widoczny dla zalogowanych], the best thermal performance management. In Re 0.55 × l04 ~. 4 × l04 range. the overall heat transfer coefficient than the smooth tube increased by 20% a 65%. e / p value is too small,[link widoczny dla zalogowanych], no enhancement effect. (2) a certain pitch, the tube for condensation heat transfer coefficient does not always increase with the increase of groove depth,[link widoczny dla zalogowanych], but there is one. optimum groove depth. In fact, the threaded shaft to determine the best groove depth depends mainly on heat transfer enhancement and the presence of the pump power consumption constraints (3) the groove depth is the flow resistance of screw shaft size of the main factors. To reduce the threaded shaft of the fluid resistance. the use of small pitch, shallow groove depth of the screw shaft is more appropriate. References 1RabasTJ. PanchalCB.Comparison0friver-wat stare foulingmBforspi / allyindentedandpl ~ i.tubeB-He.atTransferEngineering, 1993,14 (4) :58-732FinnieumSS. WestwaterJWPropwisevsfilmwis ~ condensationofsteam0nchronium.1nt.J.HeatITmBTransfer,[link widoczny dla zalogowanych], 1989.32:1541 a l459

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