The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Dogan Eryener - One of the best experts on this subject based on the ideXlab platform.
-
Thermoeconomic optimization of baffle spacing for Shell and tube heat exchangers
Energy Conversion and Management, 2006Co-Authors: Dogan EryenerAbstract:Despite the importance of thermoeconomic analysis in Shell and tube heat exchanger design, the determination of the optimum baffle spacing by using the thermoeconomic analysis is usually neglected. On the other hand, baffle spacing is one of the most important parameters used in the design of Shell and tube heat exchangers, and there is no precise criterion for the determination of baffle spacing in the literature. In this study, thermoeconomic analysis is used to determine the optimum baffle spacing, accompanied by an example of such an optimization of baffle spacing for a Shell and tube heat exchanger. The results of this example are then used to demonstrate how the optimum ratio of baffle spacing to Shell Diameter is determined precisely and affected by the varying values of the geometrical parameters. Finally, the results are compared to those obtained by classical approaches.
Ilker Tari - One of the best experts on this subject based on the ideXlab platform.
-
Shell side cfd analysis of a small Shell and tube heat exchanger
Energy Conversion and Management, 2010Co-Authors: Ender Ozden, Ilker TariAbstract:Abstract The Shell side design of a Shell-and-tube heat exchanger; in particular the baffle spacing, baffle cut and Shell Diameter dependencies of the heat transfer coefficient and the pressure drop are investigated by numerically modeling a small heat exchanger. The flow and temperature fields inside the Shell are resolved using a commercial CFD package. A set of CFD simulations is performed for a single Shell and single tube pass heat exchanger with a variable number of baffles and turbulent flow. The results are observed to be sensitive to the turbulence model selection. The best turbulence model among the ones considered is determined by comparing the CFD results of heat transfer coefficient, outlet temperature and pressure drop with the Bell–Delaware method results. For two baffle cut values, the effect of the baffle spacing to Shell Diameter ratio on the heat exchanger performance is investigated by varying flow rate.
Wang Xiao-yue - One of the best experts on this subject based on the ideXlab platform.
-
Comparison of Growth between Sea Urchins Strongylocentrotus intermedius × S. nudus Hybrids and their Parents
Fisheries Science, 2004Co-Authors: Wang Xiao-yueAbstract:The growth comparison between sea urchins Strongylocentrotus intermedius × S. nudus hybrid and their parents was conducted during the periods of indoor intermediate culture and sea rafting cultivation. The results showed that the hybrids had heterosis: faster growth, higher gonad index and more colorfulness than their parents. Still, there was 10% higher in the the survival rate in the hybrids than that in their female parent(Strongylocentrotus intermedius) during the period of sea rafting cultivation. The hybrids reached 5 cm in Shell Diameter at Zhangzi Island 7 months earlier than their parent Strongylocentrotus intermedius did at Lingshui Waters of Dalian.
Wang Xiaoyue - One of the best experts on this subject based on the ideXlab platform.
-
comparison of growth between sea urchins strongylocentrotus intermedius s nudus hybrids and their parents
Fisheries Science, 2004Co-Authors: Wang XiaoyueAbstract:The growth comparison between sea urchins Strongylocentrotus intermedius × S. nudus hybrid and their parents was conducted during the periods of indoor intermediate culture and sea rafting cultivation. The results showed that the hybrids had heterosis: faster growth, higher gonad index and more colorfulness than their parents. Still, there was 10% higher in the the survival rate in the hybrids than that in their female parent(Strongylocentrotus intermedius) during the period of sea rafting cultivation. The hybrids reached 5 cm in Shell Diameter at Zhangzi Island 7 months earlier than their parent Strongylocentrotus intermedius did at Lingshui Waters of Dalian.
Samah Zaki Naji - One of the best experts on this subject based on the ideXlab platform.
-
Performance analysis of Shell and tube heat exchanger: Parametric study
Case Studies in Thermal Engineering, 2018Co-Authors: Ammar Ali Abd, Mohammed Qasim Kareem, Samah Zaki NajiAbstract:Abstract Enhancement of heat transfer through Shell and tube exchangers stills taking high attention by researchers. The present work investigated the effect of Shell Diameter and tube length on heat transfer coefficient and pressure drop for Shell side with both triangular and square pitches. In addition, the effect of baffle spacing and cutting space on heat transfer coefficient and pressure drop were studied. Moreover, standards fouling rates used for both Shell and tube sides to estimate the reduced heat transfer. Increasing Shell Diameter with a triangular pitch and pull-through floating head recorded 3% increasing in heat transfer coefficient for only 0,05 m increasing in Shell Diameter. While 2.8% increase in heat transfer coefficient for Shell side by 0.05 m increasing in Shell Diameter with split-ring floating head and square pitch. Heat transfer coefficient for Shell side reduced by 15.15% by increasing baffle space by 0.2 from Shell Diameter and the pressure drop by 41.25%. Increasing cutting space from 15% to 25% decreases heat transfer coefficient by 5.56% and the pressure drop diminished by 26.3%. Increasing tube length by 0.61 m leads to enhance the heat transfer coefficient by 31.9% and pressure drop by 14.11% for tube side. For Shell side, increasing tube length by 0.61 m gives 2.2% increasing in heat transfer coefficient and 21.9% increasing for pressure drop. Fouling resistance change on Shell side shows a high effect on heat transfer more than same rate change on the tube side. Based on the result, this study can help designers to quick understand of each parameter effect on heat transfer into Shell and tube exchangers.
