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عنوان فارسی مقاله:
بررسی عددی انتقال گرما و مشخصه انتقال حرارت در یک کانال مربع گسسته ترکیب شده بافل V و روزنه V
عنوان انگلیسی مقاله:
Numerical investigation on turbulent forced convection and heat transfer characteristic in a square channel with discrete combined V-baffle and V-orifice
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Passive technique had been used to augment heat transfer rate and thermal performance in various types of heat exchangers; fin-and-tube heat exchanger, solar air heater channel, shell-and-tube heat exchanger, etc. The main objective of the passive technique is to generate the vortex flow, longitudinal vortex flow, swirling flow, impinging flow in the heating section. These behaviors disturb the thermal boundary layer on the heat transfer surface that helps to increase the heat transfer rate and efficiency. The numerical and experimental investigations on flow and heat transfer characteristics in heating or cooling systems installed with V-shaped turbulators had been widely reported [1–14]. The parameters such as height, attack angle, arrangement, etc., of the V-shaped turbulators were studied. The researchers found that the use of the V-shaped turbulators in the system performs higher heat transfer rate and thermal efficiency than the typical system. They also concluded that the V-shaped turbulators give higher effectiveness than the other shapes of the turbulators. The V-shaped turbulators were also combined with the orifice called “V-orifice”. The installation of the V-orifice in the heat exchanger was investigated byBoonloi and Jedsadaratanachai [16]. They stated that the high pressure loss is found when installed with the V-orifice. In conclusion, the V-shaped turbulators not only increase in heat transfer rate, but also enhance pressure loss. Therefore, the modified shape and installation method, which help to reduce the pressure loss in the heating system, were investigated [15].
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کلمات کلیدی:
Modelling of Convective Heat and Mass Transfer in Rotating Flows https://books.google.com/books?isbn=3319209612 Igor V. Shevchuk - 2015 - Science Igor V. Shevchuk ... in a two-pass square channel with 90 ribs. ... Numerical simulation of local heat transfer in rotating two-pass square channels. ... heat/mass transfer measurements in a rectangular duct with discrete ribs. ... PhD Thesis, EPFL, Lausanne Taslim ME, Liu H (2005) A combined numerical and experimental ... Comprehensive Nanoscience and Technology https://books.google.com/books?isbn=0123743966 2010 - Science The proper selection of the dopant distribution near channel surface is a critical issue ... Figure 87(b) shows the C–V characteristics of the discrete dopantfluctuated ... as shown in Figures 88(b) and 88(c), the square and 'x' symbols indicate the ... Passive and Discrete Circuits: Newnes Electronics Circuits Pocket Book https://books.google.com/books?isbn=1483291987 R M MARSTON - 2016 - Technology & Engineering ... Vih 9m Channel type (max)}{max}} {max}|{max}}(max)] (min-max) (typ) (typ) type no. ... Figure 17.5 lists the major static and dynamic characteristics of the VN66AF. ... V; the drain current then increases non-linearly as the gate is varied up to about ... 400mA; the device has a square-law transfer characteristic below 400mA. [PDF]Download this PDF file - IJRER www.ijrer.org/ijrer/index.php/ijrer/article/download/104/pdf by AK Patil - 2012 - Cited by 21 - Related articles Oct 20, 2011 - heat transfer and friction characteristics of artificially roughened solar ... cover-absorber plate combination, Qu is the useful energy .... higher heat transfer than that of the 90o discrete rib. Lau et al. [17], Taslim et al. [19] and Olssom and Sunden [20] investigated the effect of V-shaped ribs in square channel. Searches related to characteristic in a square channel with discrete combined V turbulent flow vs laminar flow turbulent flow reynolds number turbulence intensity calculation turbulent flow velocity profile turbulent flow equation friction velocity u* turbulent flow in pipes turbulent flow pdf
