Mechanical Engineering / Makina Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4129

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Scopus Q: search.filters.scopusQuartile.Q2Subject: search.filters.subject.Rayleigh number

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  • Article
    Citation - WoS: 12
    Citation - Scopus: 13
    Using of Bejan's Heatline Technique for Analysis of Natural Convection in a Divided Cavity With Differentially Changing Conductive Partition
    (Taylor and Francis Ltd., 2013) Koca, Ahmet; Öztop, Hakan Fehmi; Varol, Yasin; Mobedi, Moghtada
    The issue of laminar natural convection and conduction in enclosures divided by a partition with different thicknesses is investigated numerically. The partition is accepted as conductive at different thermal conductivity ratio. The cavity is filled with air, and it is heated differentially from vertical walls while horizontal walls are adiabatic. The problem is solved for different values of Rayleigh number (103 ≤ Ra ≤ 106), thickness ratio of the partition, and thermal conductivity ratio (0.1 ≤ k ≤ 10.0). It is found that both heat transfer and flow strength strongly depend on the thermal conductivity ratio of the solid material of partition and Rayleigh numbers.
  • Article
    Citation - WoS: 19
    Citation - Scopus: 18
    Heat Transfer Reduction Due To a Ceiling-Mounted Barrier in an Enclosure With Natural Convection
    (Taylor and Francis Ltd., 2011) Gediz İliş, Gamze; Mobedi, Moghtada; Öztop, Hakan Fehmi
    Effects of a ceiling-mounted barrier on natural convection heat transfer in a square cavity with differentially heated wall are numerically investigated. A limit case, in which the partition has small thickness and low thermal conductivity, is studied. The study is performed for nine different locations of barrier on the ceiling, two different lengths of barrier as 15 and 50% of the side wall, and Rayleigh numbers from 103 to 106. The vorticity and streamfunction approach is used to obtain velocity distribution, and the energy equation is solved to determine temperature field in the cavity. The variations of the local Nusselt number on the hot and cold walls and the change of mean Nusselt number with the location of barrier in the cavities with different Rayleigh numbers are presented. The obtained results show that a wall-mounted barrier can be used to reduce heat transfer rate through the cavity; however, its effectiveness depends on length and location of barrier and Rayleigh number.