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Extruded Serrated Finned Tube, Bi-metallic Fin Tubes

Extruded Serrated Finned Tubes is similar with extruded aluminum fin tube, but the aluminum fin is serrated, which great improve the fin tube heat transfer capacity.
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Description
Products Description

What Are Extruded Serrated Finned Tubes?

Extruded Serrated Finned Tubes represent the pinnacle of bimetallic heat exchanger technology, combining exceptional thermal performance with robust mechanical integrity. These specialized tubes feature an outer aluminum surface that undergoes cold plastic deformation to form precisely engineered serrated fins, dramatically enhancing heat transfer capacity compared to conventional smooth fin designs.

The unique serrated fin configuration creates turbulent flow patterns in the gas or fluid passing over the fins, breaking up the boundary layer and significantly improving thermal efficiency. This makes extruded serrated aluminum finned tubes the preferred choice for applications where space constraints, weight considerations, and thermal performance are critical factors.

Manufacturing Process: Precision Engineering

The fabrication of extruded serrated finned tubes involves a sophisticated multi-stage process that ensures optimal metallurgical bonding and dimensional accuracy:

Step-by-Step Production

  1. Tube Preparation: The inner base tube (typically carbon steel, stainless steel, or other alloys) is thoroughly cleaned and prepared.
  2. Aluminum Sleeve Insertion: An aluminum muff tube with precise wall thickness is aligned over the base tube.
  3. Cold Extrusion: The assembly passes through specialized arbors with rotating discs that apply controlled pressure, extruding the aluminum fins in a spiral pattern through cold working.
  4. Serration Process: The extruded fins undergo precision machining to create the distinctive serrated pattern, typically with 12 or 24 teeth per inch.
  5. Finishing Operations: The tubes undergo strip peeling, washing, pressure testing, blast cleaning, and final inspection before packaging.

Serrated Technical Insight

The extrusion process creates a metallurgical bond between the aluminum fin and base tube, ensuring exceptional thermal contact resistance of less than 0.0001 m²K/W. This bond remains stable even under severe thermal cycling conditions, preventing performance degradation over time.

Technical Specifications: Extruded Serrated Finned Tube Dimensions

Extruded Serrated Finned Tube Size and Material Specifications
Tube OD 10~51 (mm) 0.4"~2"
Tube Wall Thickness 1.65~3.0 (mm) 0.065"~0.118"
Tube Length ≤18,500 (mm) ≤60.7 ft
Fin Thickness 0.3~1.2 (mm) 0.012"~0.047"
Fin Height 5~16 (mm) 0.2"~0.63"
Fin Pitch 100~555 (mm) 3~14 FPI
Serration Pattern 12 or 24 teeth per inch (custom patterns available)
Fin Type Extruded Serrated

Extruded Serrated Finned Tube Material Combinations

Fin Materials

Aluminum (1100, 1060, 6063)

Copper (select applications)

Tube Materials

Carbon Steel (A179, A192, SA210)

Stainless Steel (304, 316, 321, 347)

Copper Alloys

Titanium (B338 Gr2)

Performance Parameters

Max Temperature: 300°C

Service: Medium temperature, corrosive environments

Engineering Advantages of Extruded Serrated Design

Exceptional Thermal Bond

100% metallurgical bond between fin and tube eliminates contact resistance, ensuring maximum heat transfer efficiency throughout the tubes service life.

Enhanced Corrosion Protection

The aluminum sleeve completely encapsulates the base tube, providing superior protection against atmospheric corrosion and chemical attack.

Mechanical Durability

Extruded fins demonstrate exceptional resistance to vibration, mechanical damage, and fin deformation during cleaning operations.

Optimized Fluid Dynamics

Serrated fin design creates turbulent flow, disrupting boundary layers and increasing heat transfer coefficients by 25-40% compared to smooth fins.

Reduced Pressure Drop

The unique fin geometry increases flow area, creating a "wind tunnel effect" that minimizes pressure differential across the fin surface.

Temperature Resilience

Stable performance at temperatures up to 325°C, with excellent resistance to thermal cycling stress and fin loosening.

Performance Analysis

The serrated fin design increases the effective heat transfer surface area by 15-25% compared to equivalent smooth fins, while the extrusion process ensures optimal fin density and distribution. This combination delivers superior thermal performance in compact heat exchanger designs.

Manufacturing Process Demonstration

Industrial Applications

Extruded serrated finned tubes excel in demanding applications where reliability, efficiency, and corrosion resistance are paramount:

Air Cooled Heat Exchangers
Process Gas Heaters and Coolers
Waste Heat Recovery Systems
HVAC Energy Recovery Units
Compressed Air Aftercoolers
Industrial Radiators
Charge Air Coolers
Steam to Air Heat Exchangers
Offshore Platform Heaters
Chemical Process Heaters

"The combination of extruded construction and serrated fin design represents the optimal solution for applications requiring maximum heat transfer in corrosive or fouling environments. The mechanical integrity of the fin-to-tube bond ensures long-term performance stability that alternative finning methods cannot match."

Extruded Serrated Finned Tube Product Visualization

Extruded Serrated Finned Tube - High magnification view showing fin detail and tube bonding

Extruded Serrated Finned Tube showing precise fin geometry and metallurgical bond integrity

Technical Enquiry Requirements

To provide a comprehensive quotation for extruded serrated finned tubes, please include the following specifications:

  • Base tube material specification
  • Base tube dimensions (OD × WT × Length)
  • Fin material selection
  • Fin type and serration pattern
  • Fin diameter or height requirements
  • Fin thickness specification
  • Fins per inch or fin pitch
  • Length of plain, unfinned ends
  • Total finned tube quantity
  • Additional fabrication requirements (bending, welding, assembly)