Heat transfer of pulsating laminar flow in pipes with wall thermal inertia

Yuan, Hongsheng; Tan, Sichao; Wen, Jing; Zhuang, Nailiang

doi:10.1016/j.ijthermalsci.2015.08.014

Cited by 19 publications

(5 citation statements)

References 38 publications

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“…A number of works have shown that the intensity of gas flow heat exchange under nonstationary conditions can decrease by 1.2-2.2 times in comparison with the stationary case. [9][10][11]. At the same time, some articles give other results, which indicate that gas-dynamic unsteadiness either does not significantly affect the intensity of heat transfer in pipes, or conversely, leads to an increase by 30-40% compared to a steady flow.…”

Section: Introductionmentioning

confidence: 98%

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Plotnikov

2022

Therm sci

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It is a relevant objective in thermal physics and in building reciprocating internal combustion engines (RICE) to obtain new information about the thermal-mechanical characteristics of both stationary and pulsating gas flows in a complex gas-dynamic system. The article discusses the physical features of the gas dynamics and heat transfer of flows along the length of a gas-dynamic system typical for RICE exhaust systems. Both an experimental set-up and experimental techniques are described. An indirect method for determining the local heat transfer coefficient of gas flows in pipelines with a constant temperature hot-wire anemometer is proposed. The regularities of changes in the instantaneous values of the flow rate and the local heat transfer coefficient in time for stationary and pulsating gas flows in different elements of the gas-dynamic system are obtained. The regularities of the change in the turbulence number of stationary and pulsating gas flows along the length of RICE gas-dynamic systems are established (it is shown that the turbulence number for a pulsating gas flow is 1.3-2.1 times higher than for a stationary flow). The regularities of changes in the heat transfer coefficient along the length of the engine?s gas-dynamic system for stationary and pulsating gas flows were identified (it was established that the heat transfer coefficient for a stationary flow is 1.05-1.4 times higher than for a pulsating flow). Empirical equations are obtained to determine the turbulence number and heat transfer coefficient along the length of the gas-dynamic system.

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Section: Introductionmentioning

confidence: 98%

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Plotnikov

2022

Therm sci

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“…The heat transfer parameter of pulsated flow in wave channel was studied by [32][33][34]. Other studies focused on the hydrodynamics and heat transfer such as [35][36][37][38][39]. The use of nanofluids with pulsed flow was studied by [40][41][42][43][44][45][46][47][48] where wave and corrugated channel were used during these studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fuel Pulsatile Flow Through Wavy Channel

2024

jjmie

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In this numerical study, the heat transfers of two types of fuels, namely kerosene and gasoline, were studied within a wavy channel with pulsed flow. The CFD module at COMSOL Multiphysics was used in this study. Several variables were used and applied to both types of fuel and compared between them. These variables included the values of Reynolds numbers between 200 to 800, as well as several values of Strouhal Numbers between 0 to 0.25. Different variable values were also used for the wavy channel, including the wave numbers (0, 2, 4, 6, 8, 10) as well as variable values of the wave amplitude (0, 0.1, 0.2, 0.3). Through this study, it was observed that as Strouhal Numbers increase, there is an increase in the Nusselt Number value. It was also observed that as the number of waves increases, there is an improvement in the heat transfer values. The numerical results showed that the values of heat transfer improved with an increase in the amplitude of the wave..

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“…The effect of particle size and concentration on the pulsation characteristics of oil belongs to a sparse solidliquid two-phase flow field, on which many scholars have carried out theoretical simulation and experimental research (Abiev & Galushko, 2013;Eschmann et al, 2015;Wang et al, 2016;Yuan et al, 2016). These results have a specific reference value to investigate the influence of particle size and concentration in oil with higher viscosity on the pulsation characteristics of the oil.…”

Section: Introductionmentioning

confidence: 99%

Effects of particle size and concentration on the pulsation characteristics of transformer oil

Chen

2021

J. Natn. Sci. Foundation Sri Lanka

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The presence of particulate matter in oil has a great impact on the pulsation characteristics of oil. The effects of particle size and concentration on the pulsation characteristics of oil were studied to ensure the safe operation of oil equipment. According to the ISO 4406 standard for oil contamination, oil samples containing Cu, Fe, and SiO 2 with particle sizes of 5, 15, 25, and 50 μm and concentrations of 6.58, 4.57, 3.00, 0.971, 0.648 ppm were configured. Oil flow with different particle sizes and concentrations was tested in a square tube using PIV measurement technology. The instantaneous velocity vector data of the flow field were acquired in oil with different sizes and concentrations of the particles, and the distributions of the pulsation intensity of oil along the streamwise and normal directions were analysed. The time-frequency curves of the transient velocity and average velocity were discussed. The results showed that the distribution of the streamwise pulsation intensity of oil changes more gently along the normal direction in the centre region and changes more steeply in the near-wall area. With increasing particle concentration, the streamwise pulsation intensity of oil decreases gradually. The distribution of the normal pulsation intensity of oil along the normal direction is rough 'w'-shaped under different particle diameters. With increasing particle concentration, the main frequency trend of the oil speed along with the streamwise and normal directions decreases, and the streamwise average speed of the oil increases. The change in the normal average speed of oil decreases when the particle concentration is under 3.00 ppm. The normal velocity of oil increases when the particle concentration is over 3.00 ppm.

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Heat transfer of pulsating laminar flow in pipes with wall thermal inertia

Cited by 19 publications

References 38 publications

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Thermal-mechanical characteristics of stationary and pulsating gas-flows in a gas-dynamic system: In relation the exhaust system of an engine

Numerical Investigation of Fuel Pulsatile Flow Through Wavy Channel

Effects of particle size and concentration on the pulsation characteristics of transformer oil

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