Performance evaluation of a shell and tube heat exchanger operated with oxide based nanofluids

详细信息    查看全文

• 作者：I. M. Shahrul ; I. M. Mahbubul ; R. Saidur ; S. S. Khaleduzzaman…
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：52
• 期：8
• 页码：1425-1433
• 全文大小：819 KB
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181
• 卷排序：52

文摘

This study is about the performance evaluation of a shell and tube heat exchanger operated with nanofluid. Thermal conductivity, viscosity, and density of the nanofluids were increased, but the specific heat of the nanofluids was decreased with increasing the concentrations of the particles. The convective heat transfer coefficient was found to be 2–15 % higher than that of water at 50 kg/min of both side fluid. Nevertheless, energy effectiveness has improved about 23–52 % for the above-mentioned nanofluids. As, energy effectiveness (ɛ) is strongly depends on the density and specific heat of the operating fluids therefore, maximum ɛ has obtained for ZnO–W nanofluid and lowest found for SiO₂–W nanofluid.List of symbolsAArea (m2)A_cfCross flow area (m2)CHeat capacity rateC_pSpecific heat capacity (J/kg K)C_rHeat capacity ratioDDia of shell (m)DDia of tube (m)KThermal conductivity (W/m K)LLength (m)\(\dot{m}_{f}\)Mass flow rate of base fluid (kg/s)\(\dot{m}_{nf}\)Mass flow rate of nano fluid (kg/s)NNumber of tubesNTUNumber of heat transfer unitsNuNusselt numberPrPrandtl numberReReynolds numberU_oOverall heat transfer coefficient (W/m2 K)WWater