An Experimental Study of Evaporation Heat Transfer of Refrigerant HCFC22 Inside an Internally Grooved Horizontal Tube
スポンサーリンク
概要
- 論文の詳細を見る
The characteristics of flow pattern, heat transfer and pressure drop of evaporation of HCFC 22 inside a horizontal tube are experimentally revealed. The experiment is conducted with a double-tube evaporator, where the refrigerant flows inside the inner tube and the heating water flows countercurrently in the surrounding annulus. The inner tube is an internally grooved copper tube having a 9.52 mm o. d. and an 8.72 mm mean i. d. The ranges tested for the refrigerant are as follows : mass velocity of 110 to 220 kg/ (m^2s), vapor pressure of 0.4 to 0.65 MPa and heat flux of 5 to 35 kW/m^2. The flow pattern observed through sight glasses changes from the wavy-annular type to the annular type and then to the mist flow type as the evaporation progresses along the tube. These transitions of flow patterns occur at much lower values of vapor qualities than those predicted from the Baker map modified by Scott for a smooth tube. The heat transfer coefficients in the wavy-annular and annular flow regions are about 2 to 4 times higher than those of smooth tubes, and are expressed as a simple function of the Lockhart-Martinelli parameters. The empirical equations for the heat transfer coefficient in the mist flow region and in the single phase heat transfer region are also presented. The accuracy of these equations along with the value of the transition quality is confirmed in a comparison between the design calculations and the experimental data.
- 一般社団法人日本機械学会の論文
- 1995-11-15
著者
-
Koyama Shigeru
Institute Of Advanced Material Study Kyushu University
-
Fujii T
Post Graduate School The University Of East Asia
-
KUWAHARA Ken
Institute of Advanced Material Study, Kyushu University
-
Kuwahara Ken
Institute For Materials Chemistry And Engineering Kyushu University
-
Koyama Shigeru
Institute For Materials Chemistry And Engineering Kyushu University
-
Fujii Tetsu
Post Graduate School The University Of East Asia
-
Inoue Norihiro
Faculty Of Mercantile Marine Science Tokyo University Of Mercantile Marine
-
Hirakuni Satoshi
Mitsubishi Electric Co., Ltd., Shizuoka Works
-
Hirakuni Satoshi
Mitsubishi Electric Co. Ltd. Shizuoka Works
-
Koyama Shigeru
Institute Advanced Material Study Kyushu University
関連論文
- Characteristics of Evaporation Heat Transfer and Flow Pattern of Pure Refrigerant HFC134a in a Horizontal Capillary Tube
- E209 CHARACTERISTICS OF EVAPORATION HEAT TRANSFER AND FLOW PATTERN OF PURE REFRIGERANT HFC134a IN A HORIZONTAL CAPILLARY TUBE(Evaporation-1)
- TED-AJ03-292 FLOW AND ABSORPTION CHARACTERISTICS OF AMMONIA-WATER MIXTURE IN A SLUG FLOW ABSORBER AT LOW SOLUTION FLOW RATE
- Isothermal Adsorption Measurement for the Development of High Performance Solid Sorption Cooling System
- Multi-Bed Multi-Stage Adsorption Refrigeration Cycle-Reducing Driving Heat Source Temperature
- Local Heat and Mass Transfer in a Counter-current Slug Flow Absorber for Ammonia-water Absorption Heat Pump System (特集 ACRA-2002講演論文選集(1))
- TED-AJ03-559 DEVELOPMENT OF MULTI-BED ADSORPTION CHILLER FOR LOW-TEMPERATURE WASTE HEAT RECOVERY
- Experiments on Single Phase Heat Transfer and Pressure Drop in a Spiral Capillary Tube
- Experimental Study on Flow Boiling Heat Transfer and Pressure Drop Characteristics of HFC134a in a Multi-Port Extruded Tube
- I302 CONDENSATION OF BINARY ZEOTROPIC WORKING FLUID IN A PLATE HEAT EXCHANGER(Condensation and heat exchanger)
- TED-AJ03-200 EXPERIMENTAL STUDY ON VAPOR-LIQUID TWO-PHASE FLOW OF R134A INSIDE SMOOTH AND MICROFIN TUBES : RELATION OF VOID FRACTION AND VAPOR QUALITY AT ADIABATIC CONDITION
- TED-AJ03-311 HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS OF R134a CONDENSING IN A MULTI-PORT EXTRUDED TUBE
- I303 HEAT TRANSFER CHARACTERISTICS OF PURE REFRIGERANT HFC134a CONDENSING IN A MULTI-PORT EXTRUDED TUBE(Condensation and heat exchanger)
- An Experimental Study of Evaporation Heat Transfer of Refrigerant HCFC22 Inside an Internally Grooved Horizontal Tube
- Condensation of Binary Refrigerant Mixtures in a Horizontal Smooth Tube
- Numerical study on in-tube laminar heat transfer characteristics of CO_2 at supercritical condition
- Experiment on Cooling Heat Transfer of Carbon Dioxide in a Multi-Port Extruded Tube at Supercritical Pressure
- Condensation of A Ternary Zeotropic Refrigerant Mixture in A Horizontal Micro-fin Tube