scholarly journals Numerical studies on sizing/ rating of plate fin heat exchangers for a modified Claude cycle based helium liquefier/ refrigerator

2017 ◽  
Vol 171 ◽  
pp. 012091
Author(s):  
M Goyal ◽  
A Chakravarty ◽  
M D Atrey
Keyword(s):  
Heat Exchangers ◽  
Numerical Studies ◽  
Helium Liquefier

scholarly journals Numerical Studies into Hydrodynamics and Heat Exchange in Heat Exchangers Using Helical Square and Oval Tubes

2015 ◽  
Vol 12 (Special-Edn2) ◽  
pp. 719-724
Author(s):  
Rinat Shaukatovich Misbakhov ◽  
Viktor Mihaylovich Gureev ◽  
Nikolai Ivanovich Moskalenko ◽  
Andrey Mihaylovich Ermakov ◽  
Ilyas Zul’fatovich Bagautdinov
Keyword(s):  
Heat Exchange ◽  
Heat Exchangers ◽  
Numerical Studies

A helium liquefier with liquid flow heat exchangers

Cryogenics ◽  
1965 ◽  
Vol 5 (6) ◽  
pp. 338-341
Author(s):  
E.S Borovik ◽  
B.P Batrakov ◽  
P.M Kobzev
Keyword(s):  
Liquid Flow ◽  
Heat Exchangers ◽  
Helium Liquefier ◽  
Flow Heat

Vibro-Impact Responses of a Tube with Tube-Baffle Interaction

1978 ◽  
Vol 5 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Y.S. Shin ◽  
D.E. Sass ◽  
J.A. Jendrzejczyk
Keyword(s):  
Heat Exchangers ◽  
Impact Response ◽  
Elastic Contact ◽  
Baffle Plate ◽  
The Finite Element Method ◽  
Linear Elastic ◽  
Numerical Studies ◽  
Vibrational Characteristics ◽  
Manufacturing Tolerances ◽  
Good Agreement

The relatively small, inherent tube-to-baffle hole clearances associated with manufacturing tolerances in heat exchangers affect the vibrational characteristics and the response of the tube. Numerical studies were made to predict the vibro-impact response of a tube with tube-baffle interaction. The finite element method has been employed with a non-linear elastic contact spring-dashpot to model the effect of the relative approach between the tube and the baffle plate. The numerical analysis results are in reasonably good agreement with those of the experiments.

scholarly journals Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins

2020 ◽  
Vol 10 (23) ◽  
pp. 8689
Author(s):  
Atefeh Maleki Zanjani ◽  
Kobra Gharali ◽  
Armughan Al-Haq ◽  
Jatin Nathwani
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Rate ◽  
Heat Exchangers ◽  
Transfer Rate ◽  
Response Times ◽  
Fluid Temperature ◽  
Physical Conditions ◽  
Ground Heat Exchangers ◽  
Numerical Studies ◽  
Operation Costs

Using fins on the inner and outer surfaces of pipes is one method to improve the heat transfer rate of ground heat exchangers (GHEs), thereby reducing the borehole depth and construction and operation costs. Results of 3D numerical studies of simple and finned U-tubes with outer and inner fins are evaluated for GHEs under similar physical conditions. Dynamic and static simulations show the effects of longitudinal fins on the thermal performance of borehole heat exchangers (BHEs) and heat transfer rate between circulating fluid and soil around pipes, while the dynamic tests include short timescale and frequency response tests. The results indicate that the maximum fluid temperature change is about 2.9% in the external finned pipe and 11.3% in the internal finned pipe compared to the finless pipe. The effects of the inlet velocity on temperature profiles, the patterns of the velocity and temperature contours due to the borehole curvature and the response times of the systems under various frequencies are also investigated in detail.

scholarly journals Influence of capsule length and width on heat transfer in capsule-type plate heat exchangers

2019 ◽  
Vol 11 (12) ◽  
pp. 168781401989574 ◽  
Author(s):  
Chen Jiang ◽  
Wenxue Zhou ◽  
Xiaoying Tang ◽  
Bofeng Bai
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Low Flow ◽  
Width Ratio ◽  
Plate Heat ◽  
Longitudinal Vortices ◽  
Wake Vortices ◽  
Capsule Type ◽  
Numerical Studies ◽  
Length Width

Capsule-type plate heat exchanger has the advantages of less deposition and low flow resistance. Based on previous research, numerical studies of capsule-type plate heat exchangers with different capsule lengths and widths for the Reynolds number ranging from 600 to 10,000 are performed. The results show that wake vortices, transverse vortices, and longitudinal vortices generate in the channels by the flow shearing and separation. The vortices promote the swirl and flow destabilization, exchange the fluid between the boundary layer and the mainstream, and thus enhance the heat transfer in the capsule-type plate channels. Wake vortices transform to longitudinal vortices with increasing Re. The number of the longitudinal vortices decreases and the size of the longitudinal vortices increases with increasing Re or the decreasing length−width ratio of the capsule. In addition, Nusselt number and friction factor decrease with the increasing length−width ratio of the capsule.

Sign in / Sign up

Export Citation Format

Share Document