عنوان المقالة:THERMALLY DEVELOPING MIXED CONVECTION IN A HORIZONTAL EQUILATERAL TRIANGULAR CHANNEL THERMALLY DEVELOPING MIXED CONVECTION IN A HORIZONTAL EQUILATERAL TRIANGULAR CHANNEL
Thamer Khalif Salem, Raaid R. Jassem & Manar Salih Mahdi
Abstract
An experimental study has been conducted to investigate thermal developing, mixed convection, in a horizontal
equilateral triangular channel heated uniformly. An experimental work has been conducted for horizontal equilateral
triangular channel, heated uniformly, to investigate thermally developing mixed convection. The channel was (1.5
m) long and constructed from three plane (100 mm) walls to form the equilateral triangular cross section. These
experiments had been conducted for range values of (115 ≤ af ≤ 237(W/m2))) of heat flux and for the range (0.0005
≤ m ≤ 0.0015(kg/sec.)) of air mass flow rate.
The test apparatus has been manufactured first, Then a thermocouples have been stickled in proper positions. Then
many readings, for temperatures, have been registered for each thermocouple. These readings have been taken for
different speeds of the outlet air (from the Equilateral triangular channel).
Five tests for the heat flux have been conducted, for each one of them three values of air mass flow-rate have been
used. It has been noticed that the surface temperature of test has a proportional relation with the channel length. And
this is found for all values of the heat flux and air mass flow-rate .
It was found that the temperature ratio and local Nusselt number had increased with increasing the heat fluxes and
the mass flow rate. Also it was found that the greatest local Nusselt number value was in the entrance of the channel
then it decreased accompanied by growing the thermal boundary layer along the channel.
Abstract
An experimental study has been conducted to investigate thermal developing, mixed convection, in a horizontal
equilateral triangular channel heated uniformly. An experimental work has been conducted for horizontal equilateral
triangular channel, heated uniformly, to investigate thermally developing mixed convection. The channel was (1.5
m) long and constructed from three plane (100 mm) walls to form the equilateral triangular cross section. These
experiments had been conducted for range values of (115 ≤ af ≤ 237(W/m2))) of heat flux and for the range (0.0005
≤ m ≤ 0.0015(kg/sec.)) of air mass flow rate.
The test apparatus has been manufactured first, Then a thermocouples have been stickled in proper positions. Then
many readings, for temperatures, have been registered for each thermocouple. These readings have been taken for
different speeds of the outlet air (from the Equilateral triangular channel).
Five tests for the heat flux have been conducted, for each one of them three values of air mass flow-rate have been
used. It has been noticed that the surface temperature of test has a proportional relation with the channel length. And
this is found for all values of the heat flux and air mass flow-rate .
It was found that the temperature ratio and local Nusselt number had increased with increasing the heat fluxes and
the mass flow rate. Also it was found that the greatest local Nusselt number value was in the entrance of the channel
then it decreased accompanied by growing the thermal boundary layer along the channel.
رائد رشاد جاسم | Raaid Rashad Jassem | 4690