3D Heat Exchanger Inlet Distributor for Uniform Flow Fields
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Solution Overview
Problem
Existing heat exchanger designs require elongated diffusers to achieve uniform flow, which occupy excessive space and lead to inefficiencies in heat transfer due to potential swirl and pressure loss, especially when elements like tees and elbows are present in the inlet pipe.
Innovation Solution
A compact heat exchanger heat transfer enhancement device featuring a flow distribution device with differently sized holes at the inlet, a diffusion portion with increased cross-section, and a converging portion with a decreasing cross-section, along with a screen and partition to ensure uniform flow and reduce pressure loss, allowing for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elongated diffuser is used to achieve uniform flow, then heat exchange performance is improved, but the space occupied in the heat exchanger facility increases
Solution Approach 1:
The diffuser is divided into multiple sections with different expansion ratios along the flow direction. The first section has a larger expansion ratio to quickly establish uniform flow, while subsequent sections have smaller expansion ratios to maintain stability. This segmentation allows achieving uniform flow distribution without requiring an excessively long diffuser, thus reducing the space occupied while maintaining heat exchange performance.
Solution Approach 2:
The expansion ratio parameter of the diffuser is optimized by setting different values for different sections. The first section uses a larger expansion ratio (e.g., 15-30 degrees) to rapidly distribute flow uniformly, while later sections use smaller ratios (e.g., 5-15 degrees) to prevent flow separation. This parameter optimization achieves uniform flow distribution with a shorter diffuser length, reducing the volume occupied.
2Ease of operation
If elements like tees and elbows are present in the inlet pipe, then fluid flow is achieved, but swirl occurs and pressure loss increases
Solution Approach 1:
The diffuser structure is designed to preliminarily correct flow disturbances before the fluid enters the heat exchanger. By gradually expanding the flow area in controlled sections, the diffuser straightens swirling flow patterns and redistributes velocity profiles, eliminating the adverse effects of upstream fittings like tees and elbows before they can cause significant pressure loss in the heat exchanger.
Solution Approach 2:
The diffuser acts as an intermediary component between the inlet pipe with fittings and the heat exchanger. It mediates the flow by gradually transforming the disturbed, swirling flow from the inlet pipe into a uniform, straight flow suitable for the heat exchanger, thereby reducing pressure loss while maintaining ease of operation with standard pipe fittings.
3Reliability
If the diffuser distance from pipe to heat exchanger is increased, then uniform flow field is formed, but the facility becomes less compact
Solution Approach 1:
The diffuser is segmented into multiple sections with progressively changing expansion ratios. The first section has a larger expansion angle to quickly establish uniform flow distribution, while subsequent sections have smaller angles to maintain flow stability. This segmentation achieves uniform flow field formation in a shorter overall length, making the facility more compact while maintaining reliability.
Solution Approach 2:
The diffuser employs asymmetric expansion ratios in different sections rather than a uniform expansion throughout. The initial section has a steeper expansion angle to rapidly distribute flow, while later sections have gentler angles. This asymmetric design optimizes the balance between achieving uniform flow and minimizing the required length, resulting in a compact facility layout.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves improved heat transfer efficiency by forming a uniform flow field, reducing pressure loss, and allowing for a more compact installation by shortening the diffusion portion and utilizing a screen to disperse fluid flow effectively across the heat exchanger surface.
Implementation Method 1
a diffusion portion having a cross-section increased from the inlet toward the heat exchanger
Implementation Method 2
a converging portion having a cross-section decreased from the heat exchanger toward an outlet
Implementation Method 3
a heat exchanger through which the fluid introduced from the flow distribution device passes to be cooled
Implementation Method 4
As the diffused fluid passes through an inside of the heat exchanger, heat exchange is performed with heat dissipation fins to cool the fluid
Data Source
AI summary
Provided is a heat exchanger heat transfer enhancement device, and in particular, to a heat exchanger heat transfer enhancement device by allowing a fluid flowing into a heat exchanger to form a uniform flow field. A flow distribution device is disposed at an inlet of a pipe through which a fluid is introduced, and the flow distribution device includes a plurality of holes formed on a circumferential surface and an end portion to distribute the fluid to the center and the periphery. Also, a flange is formed at one end and coupled between the pipe and a diffusion portion. The distributed fluid passes through a heat exchanger, and here, one or more screens are disposed to make a flow field of the fluid more uniform.