Heat Transfer In Natural Convection

• The setup consists of a brass tube fitted in a rectangular duct in a vertical position.
• The duct is open at the top and bottom, and forms an enclosure that serves the purpose of undisturbed surrounding.
• One side of the duct is fitted with a transparent acrylic window for visualization.
• An electric heating element is kept in the vertical tube that in turns heats the tube surface.
• The heat is lost from the tube to the surrounding air by natural convection.
• The temperature of the vertical tube is measure by temperature sensors and displayed by a Digital Temperature Indicator with multi channel switch.
• The heat input to the heater is measured by a Digital Ammeter and a Digital Voltmeter and is varied by a variac. The tube surface is polished to minimize the radiation losses.

Experimentation:

• To determine average heat transfer coefficient under natural convection

Utilities required:

• Electricity Supply : 1 Phase, 220 V AC, 2 Amp.
• Table for set-up support

Technical Specifications:

• Diameter: 38 mm (approx)
• Length: 500 mm (approx)
• Heater: Nichrome Wire
• Digital Voltmeter: 0-300 Volt
• Digital Ammeter: 0-2 Amp
• Variac: 0-230 V, 2 Amp
• Digital Temp.Indicator: 0-3000C, with multi-channel switch
• Temperature Sensors: RTD PT-100 type
• Instruction Manual: An english instruction manual will be provided along with the Apparatus