Numerical study on heat transfer of oily wastewater spray falling film over a horizontal tube in a sewage source heat pump

2019 ◽  
Vol 142 ◽  
pp. 118423 ◽  
Author(s):  
Jingyu Hao ◽  
Yingjie Xu ◽  
Tianbiao He ◽  
Ning Mao ◽  
Mengjie Song ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Numerical Study ◽  
Horizontal Tube ◽  
Oily Wastewater ◽  
Falling Film ◽  
Sewage Source

Unsteady heat transfer properties of spray falling over a horizontal tube in an oily sewage source heat pump

2020 ◽  
Vol 179 ◽  
pp. 115675
Author(s):  
Ning Mao ◽  
Jingyu Hao ◽  
Tianbiao He ◽  
Yingjie Xu ◽  
Mengjie Song ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Horizontal Tube ◽  
Unsteady Heat Transfer ◽  
Transfer Properties ◽  
Sewage Source

Experimental and Numerical Study of Hydrodynamic and Heat Transfer Characteristics of Falling Film Over Metal Foam Layered Horizontal Tube

2021 ◽  
Author(s):  
Jayakumar Arjun ◽  
A. Mani
Keyword(s):  
Heat Transfer ◽  
Computational Model ◽  
Metal Foam ◽  
Numerical Study ◽  
Thickness Distribution ◽  
Ultrasonic Transducer ◽  
Horizontal Tube ◽  
Falling Film ◽  
Number Range ◽  
Hydrodynamic Behaviour

Abstract A novel non-intrusive technique based on air-coupled ultrasonic transducer was used to study the hydrodynamic behaviour of falling film over a metal foam layered horizontal tube. Copper foam having a porosity of 90.5%, brazed over a copper tube of 25.4 mm diameter was used in this study. Falling film thickness distribution in the circumferential direction and the dynamic characteristics of falling film were studied in the falling film Reynolds number range of 356 to 715, and at a tube spacing of 5 mm and 15 mm. The falling film characteristics over metal foam layered horizontal tube were compared with that over a plain horizontal tube surface. Heat transfer studies of falling film over metal foam layered tube were studied in an evaporator of a multi-effect desalination system by experiment. It was observed that the falling film heat transfer coefficient was enhanced 2.7 times by the application of metal foam over the plain horizontal tube. The measurements obtained from hydrodynamic and heat transfer studies were compared with the predictions made by a computational model and were found to be in good agreement. Metal foam properties required for the computational model were obtained using a micro-computed tomography based study.

Characteristics Study of Sewage Source Heat Pump System Based on Heat Transfer Enhancement and Acoustic Cavitation Decontamination

2014 ◽  
Vol 665 ◽  
pp. 607-610
Author(s):  
Jian Feng Qian ◽  
Ya Yuan Liu
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Pump ◽  
Treatment Time ◽  
Acoustic Cavitation ◽  
Ultrasonic Cavitation ◽  
Transfer Enhancement ◽  
Pump System ◽  
Heat Pump System ◽  
Sewage Source

Put forward an application of ultrasonic cavitation technology of the sewage source heat pump system to solve the problem of controlling pollution and emphatically discusses the principle of acoustic cavitation and the effect, to conduct a feasibility analysis of Anti-fouling in sewage source heat pump sewage side. Through analysis principle of ultrasonic cavitation and heat transfer enhancement for carrying the experiment, study the pattern of scaling in heat exchange tube for different velocity and viscosity, effect in flow rate on the ultrasonic cleaning wastewater, Effect in ultrasonic treatment time on the descaling result. Obtain that it can enhancement transfer for 48%.

Numerical Simulation of the Liquid Flowing and Heat-Transfer outside the Tube of the Horizontal-Tube Falling Film Evaporator

2012 ◽  
Vol 614-615 ◽  
pp. 296-300 ◽  
Author(s):  
Wei Kang Hu ◽  
Li Yang ◽  
Lei Hong Guo
Keyword(s):  
Heat Transfer ◽  
Horizontal Tube ◽  
Water Desalination ◽  
Falling Film ◽  
Transfer Enhancement ◽  
Film Evaporation ◽  
Film Evaporator ◽  
Spray Density ◽  
Performance Of Heat Transfer ◽  
Falling Film Evaporation

This paper mainly studies the falling film evaporator in the field of water desalination. Using the method of fluent simulates the process of the liquid flowing and heat-transfer on the horizontal-tube falling film evaporation. The author analyses the distribution of the liquid film, and obtain the rule that spray density, evaporation temperature, temperature difference and pipe diameter affect the performance of heat-transfer in a certain range. So the paper plays a guiding role in heat transfer enhancement in the falling film evaporator.

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