Experimental investigation of two phase flow instabilities in a horizontal in-tube boiling system

ÇOMAKLI Ö., KARSLİ S., YILMAZ M.

ENERGY CONVERSION AND MANAGEMENT, cilt.43, sa.2, ss.249-268, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 2
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0196-8904(01)00021-8
  • Dergi Adı: ENERGY CONVERSION AND MANAGEMENT
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.249-268
  • Anahtar Kelimeler: two phase flow instabilities, dynamic instabilities, pressure drop type instabilities, density wave type instabilities, thermal oscillations, stability boundary, horizontal tube, inlet subcooling
  • Atatürk Üniversitesi Adresli: Evet

Özet

This research covers the experimental investigation of two phase flow instabilities in a horizontal in-tube flow boiling system whose test tube is relatively long. All experiments are conducted at constant heat input, system pressure and exit restriction. Steady state characteristics for five inlet temperatures are found and presented in pressure drop versus mass flow rate diagrams. Dynamic instabilities, such as pressure drop type, density wave type and thermal oscillations are found to occur for all the investigated temperatures, and the boundaries for the appearance of these oscillations are found. As a result, the stability boundary moves to lower mass flow rates with decreasing inlet temperature, which means that the system is less stable for higher inlet temperatures. It is found that the periods and amplitudes of the pressure drop type and density wave type of oscillations decreases with decreasing mass flow rate and increases with decreasing inlet temperature. In addition, it is found that the channel length has an important effect on the two phase flow dynamic instabilities. (C) 2001 Elsevier Science Ltd. All rights reserved.