Inhaltszusammenfassung

Single-structured tubes (SST) and cross-structured tubes (CST) with helix-based structures are investigated in this study with respect to their heat transfer properties and pressure drop based on the measurements of a non-isothermal gas flow inside the tubes. The investigated Reynolds number range corresponds to relevant shell-and-tube heat exchanger applications. After a detailed description of the measuring methods used, the test facilities and their validation-appropriate wall geometries w...Single-structured tubes (SST) and cross-structured tubes (CST) with helix-based structures are investigated in this study with respect to their heat transfer properties and pressure drop based on the measurements of a non-isothermal gas flow inside the tubes. The investigated Reynolds number range corresponds to relevant shell-and-tube heat exchanger applications. After a detailed description of the measuring methods used, the test facilities and their validation-appropriate wall geometries with a high potential for heat transfer improvements are discussed. The experimental results show that the Nußelt number can be improved by varying the structure depth and angle of the helix, which can also influence the pressure drop in the tube. It is shown with numerical simulations that the tangential velocity in the single-structured tubes strongly varies with the structure angle, while the flow inside the cross-structured tubes only rotates locally.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Verfahrenstechnik, Technische Chemie

DDC Sachgruppe:
Ingenieurwissenschaften