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**Hello everyone!**

1. Homework Statement

1. Homework Statement

I want to model the irradiance on a fluid element while it is flowing, from a fixed(above or below) light source that has an irradiance that shows first order decay with time and from x-naught to x-infinity .

here are the assumptions:

-Laminar flow at fixed rate (in x-direction)

-fluid element in fixed y-value from light source (above or below, doesn't matter.

-reflection/scatter effects are insignificant

-flow is in a tube (differential irradiance in y-direction)

## Homework Equations

first order decay.

## The Attempt at a Solution

I would like some direction regarding the best approaches to model such a situation, and am comfortable with solving differential equations. Thank you so much!