Heat Transfer and Flow Resistance of Yawed Tube Bundle Heat Exchangers

1981 ◽  
Author(s):  
H. G. Groehn
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Flow Resistance ◽  
Tube Bundle

Optimal Design Method of Fins in Automotive Oil Cooler Based on the Thermal-Hydraulic Performances

2012 ◽  
Vol 490-495 ◽  
pp. 2381-2385
Author(s):  
Bao Lan Xiao ◽  
Wei Ming Wu ◽  
Xiao Li Yu ◽  
Guo Dong Lu
Keyword(s):  
Heat Transfer ◽  
Neural Networks ◽  
Optimal Design ◽  
Heat Exchangers ◽  
Flow Resistance ◽  
Design Method ◽  
Normal Operation ◽  
Oil Cooler ◽  
Optimal Design Method ◽  
Simulation Results

The excellent thermal-hydraulic performances of oil cooler are the strong guaranty for automotives’ normal operation. In this study, the thermal-hydraulic performances of compact oil cooler units with different fin size parameters are numerical simulated. According to simulation results, combined with neural networks method, the optimal fin size parameters are determined. Based on this, the effects of different fin arrange layouts on performances are also studied, and optimal layouts for different requirements for flow resistance and heat transfer performances are put forward. This optimal design method can play a guidance role for the designer and manufacturer of heat exchangers.

Study on the Conical Spiral Tube Bundle Heat Exchangers with Pulsation Flow Generator Structure

2011 ◽  
Vol 143-144 ◽  
pp. 698-702 ◽  
Author(s):  
Meng Ran Ge ◽  
Ke Yan ◽  
Pei Qi Ge ◽  
Jun Gao
Keyword(s):  
Heat Transfer ◽  
Natural Frequency ◽  
Heat Exchangers ◽  
Heat Transfer Performance ◽  
Tube Bundle ◽  
Elastic Tube ◽  
Transfer Performance ◽  
Spiral Tube ◽  
Flow Generator ◽  
Planar Elastic Tube Bundle

Elastic tube bundles are universally used in heat transfer enhancement by flow-induced vibration in heat exchangers, and the study of the heat transfer performance is of importance. The structure of conical spiral tube bundle heat exchanger was introduced first, and the structure of pulsation flow generator was also introduced. The frequency of pulsation flow was discussed. Finally, in condition of same shell side diameter, the heat transfer and natural frequency of the conical spiral tube bundle were compared with the planar elastic tube bundle. The results show that the natural frequency of conical spiral tube bundle was smaller, the heat transfer performance of conical spiral tube bundle was better than the planar elastic tube bundle.

scholarly journals Condensation of refrigerant R407C in multiport minichannel section

2016 ◽  
Vol 37 (4) ◽  
pp. 3-18
Author(s):  
Tadeusz Bohdal ◽  
Henryk Charun ◽  
Małgorzata Sikora
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Flow Resistance ◽  
State Of The Art ◽  
Condensation Process ◽  
Test Results ◽  
Pressure Drops ◽  
The Impact ◽  
Made In

AbstractAnalysis of the state of-the-art in research of refrigerant condensation in miniature heat exchangers, so-called multiports, was made. Results of refrigerant R407C condensation in a mini condenser made in the form of two bundles of tubular minichannels from stainless steel with an inside diameter 0.64 mm and length 100 mm have been presented. Two exchangers consisted of four minichannels and 8 minichannels have been investigated. The values of average heat transfer coefficient and frictional pressure drops throughout the condensation process were designated. The impact of the vapor quality of refrigerant and the mass flux density on the intensity of heat transfer and flow resistance were illustrated. A comparative analysis of test results for various refrigerants in both mini heat exchangers were made.

scholarly journals Numerical Investigation on the Optimum Thermal Design of the Shape and Geometric Parameters of Microchannel Heat Exchangers with Cavities

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 721
Author(s):  
Haiwang Li ◽  
Yujia Li ◽  
Binghuan Huang ◽  
Tiantong Xu
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Flow Resistance ◽  
Stokes Equations ◽  
Geometric Parameters ◽  
Thermal Design ◽  
Low Flow ◽  
High Heat Transfer ◽  
The Impact

Due to the large surface-area-to-volume ratio, microchannel heat exchangers have a higher heat transfer rate compared with traditional scale heat exchangers. In this study, the optimum microchannel cavity with high heat transfer and low flow resistance is designed to further improve microchannel exchangers’ thermal performance. A three-dimensional laminar flow model, consisting of Navier–Stokes equations and an energy conservation equation is solved and the conjugate heat transfer between the silicon basement and deionized water is taken into consideration. The impact of the shape, aspect ratio, size and spacing of the cavity on the thermal performance of microchannel exchangers are numerically investigated, respectively. The results indicated that the cavity on the sidewall can enhance heat transfer and reduce flow resistance simultaneously, and cavities with a relatively small expansion angle and streamlined edge could enhance thermal performance the most. Based on the conclusions, a new cavity shape is proposed, and the simulation results verify its excellent thermal performance as expected. Furthermore, investigation is performed to figure out the optimum design of the new cavity and the optimal geometric parameters of the cavity under different flow conditions have been obtained in principle for microchannel exchangers’ design.

A numerical study of heat transfer in the in-line tube bundle under pulsating fluid flow conditions

Vestnik IGEU ◽  
2019 ◽  
pp. 12-21
Author(s):  
A.I. Khaibullina ◽  
A.R. Khairullin
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Numerical Study ◽  
Tube Bundle ◽  
Cross Flow ◽  
Pulsating Flow ◽  
Operating Parameters ◽  
Flow Conditions ◽  
Study Results ◽  
Shell And Tube

Shell-and-tube heat exchangers are widely used in different industries. Even a small increase in the efficien-cy of shell-and-tube heat exchangers can lead to significant energy savings. One of the ways to improve the efficiency of shell-and-tube heat exchangers is the use of pulsating flows for the enhancement of heat ex-change. Despite the fact that heat transfer in the tube bundle cross flow in steady-state conditions has been studied quite well, there is limited data on heat transfer in pulsating flow, which means that the problem of finding regularities of heat transfer with pulsating flows in tube bundles is still important. The work employs the incompressible Reynolds averaged Naviere-Stokes (URANS) equations and the continuity equation. Heat transfer is described by the convective heat transfer (Fourier-Kirchhoff) equation. The calculations are performed using Ansys Fluent. A numerical study has been conducted of the effects of forced asymmet-rical pulsating flow on heat exchange in in-line tube bundle cross-flow conditions. In the numerical experi-ment the Reynolds number Re ranged from 1000 to 2000, the relative pulsating amplitude A/D – from 1 to 2, the Strouhal number Sh – from 0,77 to 1,51, the Prandtl number and the duty cycle had fixed values: Pr = 7,2,  = 0,25. The relative transverse and longitudinal pitch was s1,2/D = 1,3. It has been found that pulsating flows lead to the enhancement of heat transfer in the whole range of the studied operating parameters. An increase in A/D and Sh leads to bigger Nusselt number Nu. An increase in the Re number leads to a de-crease in the Nu ratio in pulsating and steady flow conditions. The general correlation obtained based on the numerical study results can be used to predict heat transfer in a pulsating flow in the range of the studied geometric and operating parameters. More research is needed to predict heat transfer in a wider range of operating parameters and with other tube bundle configurations.

Experimental study on flue gas condensate capture and heat transfer in staggered tube bundle heat exchangers

2018 ◽  
Vol 141 ◽  
pp. 819-827 ◽  
Author(s):  
Enlu Wang ◽  
Kai Li ◽  
Naveed Husnain ◽  
Deli Li ◽  
Jinda Mao ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Flue Gas ◽  
Heat Exchangers ◽  
Tube Bundle ◽  
Gas Condensate

scholarly journals Experimental study on the heat transfer and resistance characteristics of pin-fin tube

2019 ◽  
pp. 168-168
Author(s):  
Yungang Wang ◽  
Yang Liu ◽  
Xingqiao Wang ◽  
Qinxi Zhao ◽  
Zhiwu Ke
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Flow Resistance ◽  
Tube Bundle ◽  
Structural Parameters ◽  
Pin Fin ◽  
Tube Bundles ◽  
Fin Tube ◽  
Fin Spacing

In order to obtain the influence of the structural parameters of the pin-fin tube on the heat transfer and resistance characteristics, ten different structural parameters of the pin-fin tube bundle were studied in this paper. The influence of the transverse pitch and the longitudinal pitch of the tube bundles, the transverse fin spacing and the height of the fin on the heat transfer and resistance characteristics of the pin-fin tube bundle were obtained, and the corresponding correlations were proposed. The results showed that the convection heat transfer coefficient and the flow resistance increased with the longitudinal pitch of the tube. The transverse fin spacing decreased, the heat transfer coefficient and the flow resistance increased. The change of the transverse pitch and the height of the pin-fin had little effect on the heat transfer and resistance performance of the tube bundles.

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