ANALYSIS OF HEAT TRANSFER ENHANCEMENT IN TUBES WITH CAPSULE DIMPLED SURFACES AND Al2O3-WATER NANOFLUID

被引:1
|
作者
Yapici, Ekin Ozgirgin [1 ]
Ibrahim, Mahmoud Awni A. Haj [1 ]
Turkoglu, Hasmet [1 ]
机构
[1] Cankaya Univ, Dept Mech Engn, Ankara, Turkey
关键词
Heat transfer enhancement; nanofluid; capsule dimples; computational analysis; FORCED-CONVECTION; PRESSURE-DROP;
D O I
10.47480/isibted.1203793
中图分类号
O414.1 [热力学];
学科分类号
摘要
This study aims to numerically investigate and evaluate the enhancement of heat transfer by new capsule dimples on tube surfaces for flow of water and Al2O3-water nanofluid with different concentrations, under uniform surface heat flux. The originality of this work lies in combining two passive heat transfer enhancement methods such as geometrical improvements and nanofluids together. Capsule dimples with different depths were considered. Al2O3- water nanofluid was modeled as a single-phase flow based on the mixture properties. The effects of dimple depth and nanoparticle concentrations on Nusselt number, friction factor and performance evaluation criteria (PEC) were studied. Numerical computations were performed using ANSYS Fluent commercial software for 2000-14000 Reynolds number range. It was found that when laminar, transient and fully developed turbulent flow cases are considered, increase in the dimple depth increases the Nusselt number and friction factor for both pure water and Al2O3-water nanofluids cases. Also, the friction factor increases as dimple depth increases. Results show that increase in PEC is more pronounced in the laminar region than in the transition region, it starts to decrease for turbulent flows. For nanofluid, PEC values are considerably higher than pure water cases. The variation of PEC for capsule dimpled tubes are dependent on flow regimes and dimple depths. Increasing the nano particle volume concentration and dimple depth in laminar flows increase the PEC significantly.
引用
收藏
页码:269 / 280
页数:12
相关论文
共 50 条
  • [31] Thermophysical Performances of Al2O3-water Nanofluids and its Heat Transfer Enhancement in Heat Pipe
    Li, Dongdong
    Zhao, Weilin
    Li, Jinkai
    Guan, Yanxiang
    Liu, Zongming
    NANO-SCALE AND AMOURPHOUS MATERIALS, 2011, 688 : 339 - 343
  • [32] Al2O3-Water Nanofluids in Convective Heat Transfer
    Prajapati, Om Shankar
    Rajvanshi, A. K.
    MECHANICAL AND AEROSPACE ENGINEERING, PTS 1-7, 2012, 110-116 : 3667 - 3672
  • [33] Al2O3-Water Nanofluids for Heat Transfer Application
    Lakshita Phor
    Tanuj Kumar
    Monika Saini
    Vinod Kumar
    MRS Advances, 2019, 4 : 1611 - 1619
  • [34] Heat transfer performance of jet impingement flow boiling using Al2O3-water nanofluid
    Chang, Tong-Bou
    Yang, Yen-Kai
    JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, 2014, 28 (04) : 1559 - 1566
  • [35] EFFECTS OF PARTICLE VOLUME FRACTION ON SPRAY HEAT TRANSFER USING AL2O3-WATER NANOFLUID
    Chang, Tong-Bou
    Syu, Siou-Ci
    Yang, Yen-Kai
    23RD IIR INTERNATIONAL CONGRESS OF REFRIGERATION, 2011, 23 : 482 - 490
  • [36] Effects of particle volume fraction on spray heat transfer performance of Al2O3-water nanofluid
    Chang, Tong-Bou
    Syu, Siou-Ci
    Yang, Yen-Kai
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2012, 55 (04) : 1014 - 1021
  • [37] Heat transfer performance of jet impingement flow boiling using Al2O3-water nanofluid
    Tong-Bou Chang
    Yen-Kai Yang
    Journal of Mechanical Science and Technology, 2014, 28 : 1559 - 1566
  • [38] Thermofluidic analysis of Al2O3-water nanofluid cooled branched wavy heat sink
    Kumar, Ritesh
    Tiwary, Badyanath
    Singh, Pawan Kumar
    APPLIED THERMAL ENGINEERING, 2022, 201
  • [39] Thermofluidic analysis of Al2O3-water nanofluid cooled branched wavy heat sink
    Kumar, Ritesh
    Tiwary, Badyanath
    Singh, Pawan Kumar
    Applied Thermal Engineering, 2022, 201
  • [40] NUMERICAL STUDY OF FLUID FLOW AND HEAT TRANSFER FOR AL2O3-WATER NANOFLUID IMPINGING JET
    Vaziel, Parisa
    Abouali, Omid
    ICNMM 2009, PTS A-B, 2009, : 977 - 984