scholarly journals A Study on the Flow Resistance of Fluids Flowing in the Engine Oil-Cooler Chosen

Lubricants ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 75
Author(s):  
Bogdan Derbiszewski ◽  
Marek Wozniak ◽  
Lukasz Grala ◽  
Michal Waleciak ◽  
Maksym Hryshchuk ◽  
...  
Keyword(s):  
High Performance ◽  
Flow Resistance ◽  
Resistance Coefficient ◽  
Test Stand ◽  
Engine Oil ◽  
Liquid Temperature ◽  
Oil Cooler ◽  
Engine Coolant ◽  
Piston Cooling ◽  
Flow Resistances

Oil-coolers are necessary components in high performance diesel engines. The heat removed by the cooler is a component in the total heat rejection via the engine coolant. Oil-cooler absorbs the heat rejected during the piston cooling and engine rubbing friction power loss. During flows of both coolant and engine oil via the oil-cooler, some flow resistances occur. The aim of the study is to determine values of the flow resistance coefficient for oil going through the cooler at various temperatures. The test stand was developed to determine time needed to empty tanks from liquids flowing through oil-cooler. The flow model was elaborated to study the mentioned flow resistance coefficient with respect to changing liquid temperature. The 20 °C increase in liquid temperature resulted in a flow resistance coefficient decrease of 30% for coolant and of the much more for engine oil. It was found that better results would be achieved with flows forced by means of pumps instead of using gravitational forces on the test stand.

scholarly journals The Thermal Stability of Aviation Fuel

1984 ◽  
Author(s):  
J. S. Mills ◽  
F. R. Edwards
Keyword(s):  
Thermal Stability ◽  
Research Tool ◽  
Aviation Fuel ◽  
Engine Oil ◽  
Thermally Stable ◽  
Fuel System ◽  
Flow Rates ◽  
Aircraft Fuel ◽  
Oil Cooler ◽  
Thermal Stability Of

The propensity of aviation turbine fuels to produce deposits in the oil-cooler and filter sections of aircraft fuel systems has been examined using a rig that simulates the fuel system of an aircraft and which employs realistic flow rates. All the fuels examined were found to be thermally stable up to temperatures in excess of those currently attained in engine oil coolers. Comparison with results obtained with the JFTOT indicates that this is not suited for use as a research tool.

Convective Cooling of Compact Electronic Devices via Liquid Metals with Low Melting Points

2021 ◽  
Author(s):  
Guilin Liu ◽  
Jing Liu
Keyword(s):  
Heat Transfer ◽  
Melting Point ◽  
Liquid Metal ◽  
High Performance ◽  
Flow Resistance ◽  
Heat Dissipation ◽  
Liquid Metals ◽  
Electronic Devices ◽  
Convective Cooling ◽  
Heat Exchanger Design

Abstract The increasingly high power density of today's electronic devices requires the cooling techniques to produce highly effective heat dissipation performance with as little sacrifice as possible to the system compactness. Among the currently available thermal management schemes, the convective liquid metal cooling provides considerably high performance due to their unique thermal properties. This paper firstly reviews the studies on convective cooling using low-melting-point metals published in the past few decades. A group of equations for the thermophysical properties of In-Ga-Sn eutectic alloy is then documented by rigorous literature examination, following by a section of correlations for the heat transfer and flow resistance calculation to partially facilitate the designing work at the current stage. The urgent need to investigate the heat transfer and flow resistance of forced convection of low-melting-point metals in small/mini-channels, typical in compact electronic devices, is carefully argued. Some special aspects pertaining to the practical application of this cooling technique, including the entrance effect, mixed convection, and compact liquid metal heat exchanger design, are also discussed. Finally, future challenges and prospects are outlined.

Tribological Dependence of the High-Performance Ferrous-Based Coating on Different Coating Counterparts in Engine Oil

2016 ◽  
Vol 59 (3) ◽  
pp. 399-407 ◽  
Author(s):  
Yongxin Wang ◽  
Bin Wang ◽  
Jinlong Li ◽  
Fuqiang Ma ◽  
Qunji Xue
Keyword(s):  
High Performance ◽  
Engine Oil

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.

Numerical Investigation on Cooling Air Flow and Resistance Characteristics Inner Laminated Cooling Structures

2019 ◽  
Author(s):  
Wei Song ◽  
Huazhao Xu ◽  
Xiaofang Cheng ◽  
Jianhua Wang
Keyword(s):  
Numerical Investigation ◽  
Flow Rate ◽  
Film Cooling ◽  
Gas Turbines ◽  
Flow Resistance ◽  
Resistance Coefficient ◽  
Inlet Velocity ◽  
Cooling Air ◽  
Laminated Structures ◽  
Simple Film

Abstract Today, laminated cooling structures have been widely used in the designs of advanced gas turbines, because the structures with double walls, pins, impingement holes and film holes can provide much higher overall cooling effectiveness than simple film cooling. Of course, this kind of cooling structures also leads to a higher price due to a larger flow resistance to cooling air injection in comparison with the simple film cooling. The previous investigations concerned with the laminated cooling structures mainly focused on heat transfer performances, the flow resistance characteristics within the complex channel of the structures are relatively less. This paper presents a numerical investigation on the characteristics of the cooling air resistance passing through 6 different laminated structures. The influence factors on the fluid flow and resistance performances of cooling air, such as array, density and shape of film hole, as well as impingement-hole area (diameter), are discussed and compared at the same pressure ratios of the inlet to outlet of the 6 laminated structures. The discussions and comparisons reveal the following interesting phenomena: 1) A larger diameter of impingement hole corresponds to a larger mass flow rate of cooling air at the inlet of the laminated structure, but the inlet velocity is mainly dependent on the density of film hole. At the same total area of film holes, a larger density corresponds to a higher inlet velocity. 2) The flow rate through film hole of laminated structures is influenced more and more obvious by the outlet shape and the inflow angle of film hole as the increasing pressure ratio. 3) The resistance coefficients of the entire laminated structures are dependent on the density and shape of film holes. At the same total area of film holes, a higher density corresponds to a lower resistance coefficient. Although fan-shaped film hole can provide a larger cooling air coverage, the price is a higher resistance coefficient. Therefore, the applications of fan-shaped film holes in the laminated structures should be considered only in the regions with low environment pressures.

Optimization of the lubrication system in a turbocharged engine

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940011
Author(s):  
Cho-Yu Lee ◽  
Dani Joseph Veera ◽  
Huan-Yuan Chen ◽  
Jui-Hung Chang ◽  
Kao-Ruei Hung
Keyword(s):  
Pressure Drop ◽  
Flow Resistance ◽  
Engine Speed ◽  
System Optimization ◽  
Low Flow ◽  
Lubrication System ◽  
Mechanical Loss ◽  
Oil Pump ◽  
Oil Cooler ◽  
Base Engine

Lubricating the engine reciprocating components effectively against various engine speeds is significant for a proper lubrication system. This paper presents the lubrication system optimization of a twin cylinder 700 c.c. turbocharged engine. A couple of modifications were tested including correction of ducts misalignment, consistence diameter of ducts and replacement of a low flow resistance oil cooler. Compared to the base engine, experimental results prove that differential pressure (DP) between the oil pump and main oil gallery has been decreased to a minimum 19% and maximum 54% at engine speed between 2000 and 7000 rpm. The lower the pressure drop, the lower the flow resistance. Thus, mechanical loss has also been improved.

The Parametric Modeling of Local Resistance and Pressure Drop in a Rotary Ball Valve

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Dan Wang ◽  
Changqing Bai
Keyword(s):  
Pressure Drop ◽  
Flow Resistance ◽  
Analytical Formula ◽  
Resistance Coefficient ◽  
Parametric Modeling ◽  
Equivalent Model ◽  
Local Resistance ◽  
Operating Process ◽  
Valve Opening ◽  
Good Agreement

In this paper, a theoretical study of ball valves is carried out for investigating the local resistance and pressure drop of ball valves in operating process. An equivalent model of ball valves is proposed based on the inherent mechanism of the resistance loss, which can be divided into three equivalent throttling components: a thick orifice, two variable-opening eccentric orifice plates, and a Z type elbow. Through analysis of the flow resistance of the three components, a general parametric modeling of ball valves is presented for the flow resistance analysis, and then an analytical formula of pressure drop is demonstrated. The results obtained from the presented model are compared with the prior test data to validate this model, and good agreement is observed. Indicate that the presented model has high accuracy in predicting the resistance and pressure loss in various openings. The results show that the influences of thin orifice plates play an important role in the total flow resistance coefficient and pressure drop, especially in the small opening. The effects of thick orifice plates and the Z type elbow gradually increased as the valve opening rises and becomes significant when the opening is more than 70%.

Sign in / Sign up

Export Citation Format

Share Document