Plate-fin heat exchanger with a porous blocker bar

1. A plate-fin heat exchanger, comprising:

a heat exchanger face;

a first fluid pathway running along a first axis the first fluid pathway including a first plurality of passages, each of the first plurality of passages including both a plurality of first bars running parallel to the first axis and at least one first fin oriented to allow fluid to flow along the first axis;

a second fluid pathway running along a second axis perpendicular to the first axis; and

a blocker bar having an inlet face and an outlet face;

wherein the blocker bar inlet face coincides with the heat exchanger face;

wherein the blocker bar is at an inlet of the second fluid pathway and receives a second fluid;

wherein the outlet face of the blocker bar is at the inlet of the second fluid pathway;

wherein the blocker bar includes a set of spaced apart pores that extend from the inlet face to the outlet face.

2. The plate-fin heat exchanger of claim 1 , the second fluid pathway including a second plurality of passages, each of the second plurality of passages including:

a plurality of second bars running parallel to the second axis; and

at least one second fin oriented to allow fluid to flow along the second axis.

3. The plate-fin heat exchanger of claim 2 , wherein the blocker bar is coupled to at least two of the second bars.

4. The plate-fin heat exchanger of claim 1 , wherein each pore of the set of pores is cylindrically-shaped.

5. The plate-fin heat exchanger of claim 1 , wherein the set of pores is oriented to allow flow along the second axis.

6. A plate-fin heat exchanger, comprising:

a heat exchanger face;

a first passageway;

a second passageway in a cross flow orientation to the first passageway;

a pair of non-porous sealing bars;

wherein a respective sealing bar is disposed along and at each of two respective opposing edges of the second passageway;

a porous blocker bar having a plurality of pores and an inlet face that coincides with the heat exchanger face;

wherein the porous blocker bar is at an inlet of the second passageway;

wherein the plurality of pores of the blocker bar pass fluid into the second passageway;

wherein the blocker bar is between the sealing bars and in contact with the ends of the sealing bars.

7. The porous blocker bar of claim 6 , wherein each of said the plurality of pores has a cylindrical shape.

8. The porous blocker bar of claim 6 , wherein the plurality of pores are substantially evenly spaced across a front face of the porous blocker bar.

9. The porous blocker bar of claim 6 , wherein each pore has a uniform diameter.

10. The porous blocker bar of claim 6 , wherein the height of the porous blocker bar is configured to match the height of each sealing bar and a width of a fin of the plate-fin heat exchanger.

11. The porous blocker bar of claim 6 , wherein each pore is parallel to an axis of flow through the heat exchanger.