THE EFFECT OF AUGMENTED SURFACES ON 2-PHASE FLOW INSTABILITIES IN A HORIZONTAL SYSTEM

WIDMANN F., COMAKLI O., GAVRİLESCU C. O., DİNG Y., KAKAC S.

JOURNAL OF ENHANCED HEAT TRANSFER, cilt.2, sa.4, ss.263-271, 1995 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2 Sayı: 4
  • Basım Tarihi: 1995
  • Doi Numarası: 10.1615/jenhheattransf.v2.i4.20
  • Dergi Adı: JOURNAL OF ENHANCED HEAT TRANSFER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.263-271
  • Atatürk Üniversitesi Adresli: Evet

Özet

This experimental research covers the investigation of two-phase how instabilities in a horizontal in-tube flow boiling system with augmented heat transfer surfaces. The effect of augmentation on flow instabilities is studied with three tubes made of different inner surfaces at five different inlet temperatures. All experiments are carried out at constant heat input, system pressure and exit restriction. Steady-state characteristics of a system composed of different tubes are found and presented in pressure-drop versus mass flow rate diagrams. Dynamic instabilities, such as pressure-drop type, thermal and density-wave type oscillations are found to occur in every system and boundaries for the appearance of these oscillations are found. The dependence of the characteristics of these oscillations on the augmented surfaces is emphasized and comparisons between the bare tube and the augmented tubes are made.